Terror
Tests
Additive
Search Requires More Study
By Gary Matsumoto
W A S H I N G T O N, Nov. 1 —
A group of military scientists is feverishly examining the microscopic
spores of anthrax sent to Sen. Tom Daschle for clues to a mystery that
could have profound implications for the United States and its ongoing
war on terror: Who made it?
Contained in the deadly sample
that arrived in Daschle's office on Oct. 15 are additives used to make
the normally inert bacteria a better killer, and exactly which additives
they are could point investigators in the direction of the anthrax's source,
and from there, perhaps, to who sent it.
Biological weapons experts say
producing potent samples like the spores in the Daschle letter require
advanced techniques that leave tell-tale markers to who made it — the known
manufacturers of biological agents all have different ingredients and methods
for creating their wares.
ABCNEWS reported last week that
initial tests on the Daschle letter discovered the presence of one of those
important additives, bentonite, an anti-clumping agent that makes the spores
float through the air and into the lungs more easily, and which United
Nations weapons inspectors have associated with Iraq.
This issue is critical. Making
anthrax deadlier by mixing it with such additives is a trademark of sophisticated,
well-funded, government programs, which could point to state-sponsorship
of the mail attacks. Finding bentonite or silica, a similar additive, is
one of the few solid leads investigators would have on the possible source
of the contaminated letters that have been showing up in mailrooms from
Florida to New York City.
But there is dispute over what
the additives are. The White House and the head of the Army's biological
laboratories in Ft. Detrick, Md., have denied bentonite was present, and
said even if it was, it would not necessarily point to Iraq as the culprit.
They said investigators have not
ruled out domestic or foreign sources, and, experts in the field note,
the equipment used to treat anthrax with bentonite is available on the
open market, which could lead investigators to a suspect in the United
States.
But mineralogists suggest the
matter of the bentonite may not be closed
Checking Ingredients
The government's top labs have
run the Daschle anthrax sample through a series of tests. An electron microscope
study found the Daschle spores looked "virtually identical" to those found
in Iraq by U.N. weapons inspectors in 1994. But after subjecting it to
a sophisticated X-ray test last week, the Army concluded it contained no
bentonite, a clay comprised of several minerals, including aluminum.
For the Army, no aluminum equaled
no bentonite.
"One of its principal ingredients
is aluminum," said Maj. Gen. John Parker, overall commander of the military
laboratories doing the analyses. "And I will say to you that we see no
aluminum presence in the sample."
That assessment may prove correct,
but not based solely on the absence of aluminum. ABCNEWS has learned that
at least two European chemical companies make a processed, aluminum-free
bentonite. Mineralogist William Moll, who has mainly worked in private
industry, says these synthetic bentonites are used as "free-flow agents"
that give dry powders a "fluid" or "slippery" quality as the particles
float through the air. The existence of such bentonite means further tests
are needed to rule out the presence of the troubling additive.
One of America's leading experts
on mineral clays, Hayden Murray, a professor emeritus of geology at Indiana
University, says a company based in Munich, Germany, removes aluminum from
bentonite to create a finer, more refined additive than one could make
from the bentonite deposits found in Iraq.
Murray says at least two American
companies mine such high-quality bentonite, but the German company has
a much larger customer base in the Middle East.
Last week, White House spokesman
Ari Fleischer confirmed the Armed Forces Institute of Pathology found another
additive — silica — in the Daschle anthrax. Like bentonite, silica is used
in pharmaceutical powders all over the world and would make the anthrax
float through the air more effectively.
When the United States was still
in the biological weapons business back in the 1960s, U.S. scientists experimented
with anthrax, silica and bentonite. The former Soviet Union also used silica
in powders with anthrax.
Spray Dryers
In fact, federal officials say
many countries have the materials, the technology, and the know-how to
put pharmaceutical powders to deadly use. Yet as far as anyone knows, only
the United States and the former Soviet Union have actually produced an
anthrax weapon in powdered form.
But Iraq, for one, is believed
to have been trying. In the 1980s, Baghdad purchased three spray dryers
from a Danish company for research purposes. In 1988 and 1989, Iraqi officials
asked the Danish company that manufactured the dryers to help identify
companies that would sell silica, as well as two other drying agents, kaolin
and maltodextrin.
Like many items employed in the
production of germ weapons, the dryers and the chemicals were "dual use."
Spray dryers, for instance, are commonly used to make powdered milk. U.N.
weapons inspectors say the Iraqi dryers were eventually used to make biological
weapons.
The FBI apparently has its own
suspicions about the use of spray dryers in the germ attacks. When ABCNEWS
phoned the company that sold Iraq the dryers, officials there said the
FBI had called the previous day.
'Pure Spore' Clues
The concentration of spores in
the Daschle sample is another potential clue scientists can use to find
its source.
In creating a germ weapon, microbiologists
must induce bacteria like anthrax into a spore state, a hardier form of
the cells that protects them against extreme temperatures and other environmental
stress. Spores can be induced in various ways, but American scientists
discovered one of the best techniques in the '70s, years after abandoning
its offensive biological warfare program. Iraq improved on the U.S. method,
creating a preparation that was almost 100 percent spores.
That fits Parker's description
of what he saw when he looked at the Daschle sample. "I have looked
at the specimen under the microscope, both the electron microscope and
the scanning microscope, and I can say that the sample was pure spores,"
he said. Parker also said the spores were "uniform in size," and "highly
concentrated." In an amateur preparation, experts like former Soviet biological
warfare scientist Ken Alibek would expect to see a mixture of anthrax organisms
in different stages of development. "Like a mix of seeds and plants," says
Alibek.
At times, the language of bacteriology
sounds almost botanical. When an oval-shaped spore "germinates" it grows
into a rod, which looks like a short pretzel stick. Microbiologists refer
to this as the organism's "vegetative" state. Alibek would expect a "home-brewed"
anthrax preparation to look like a hodgepodge of spores and vegetative
cells.
'Ted Kaczynski With
a Petri Dish'
But federal officials say even
the level of purity in the Daschle sample is no proof that a foreign state
is connected to the attacks. Instead, a theory favored by some federal
investigators might be described as "Ted Kaczynski with a petri dish."
According to this view, "a disgruntled Ph.D." here in America could have
launched this wave of bioterror with a "well-equipped laboratory" and a
tiny speck of virulent anthrax, which is quite simple to nurture into large
colonies. That is, if he get his hands on the right strain. America's biowarfare
scientists remain divided on this point. The trick is still making an effective
powder, which requires more than an advanced degree in microbiology. Bill
Patrick, former chief of "product development" at Fort Detrick in the waning
days of the U.S. offensive biological weapons program, believes the small
amount of anthrax recovered so far, apparently just 2 grams in the Daschle
letter, points to "a small operation."
Patrick and another Fort Detrick
veteran, Col. David Franz, both say they'd expect state-supported bioterrorists
to use larger amounts of anthrax in more ambitious attacks. For Franz,
the threshold of proof for state involvement is 50 kilograms, or 100 pounds
of anthrax, an amount that could cause, under perfect conditions, Hiroshima-like
casualties.
Former U.N. weapons inspector
Richard Spertzel disputes this logic. He maintains that the use of a small
amount of anthrax in these attacks does not prove the perpetrators only
possessed a small amount. "Look at what they've accomplished with a few
letters," says Spertzel. "They didn't need to use more."
Another dissenter from the prevailing
conventional wisdom, Alan Zelicoff of Sandia National Laboratories, admits
that a "disgruntled Ph.D." could get a hold of a virulent anthrax strain
and culture it, but "he wouldn't know the aerosol physics to create the
powder. This is a complex engineering problem," says Zelicoff.
Sources privy to the federal investigation
say the tests on the Daschle sample are still under way. Even if these
tests ultimately find bentonite, as well as silica, they will not prove
Iraqi involvement. In the language of criminology, the manufacturing techniques,
and the additives in the aerosol powders, may add up to a known modus operandi,
but they are not "fingerprints."
Although Spertzel is convinced
that the accumulating circumstantial evidence is "narrowing the field,"
he concedes that investigators may never know with certainty the identity
of the terrorists behind the germ attacks.
"I don't think that we're going
to see a smoking gun that's going to implicate this country, or that company,"
says Spertzel. "That's the hard thing to swallow with these anonymous attacks.
You want to defend yourself, but from whom?"
A Followup on Bentonite
On Nov. 1, 2001, ABCNEWS.com ran
the report above regarding the U.S. Army's analysis of the anthrax material
sent to the office of Sen. Thomas Daschle. The report included the U.S.
Army's statement that the sample had been found to contain no aluminum
and therefore could be concluded to contain no bentonite.
The story also reported on suggestions
that an unnamed German company might make a processed, aluminum-free bentonite.
That company has contacted ABCNEWS.com and said that while it does remove
some aluminum from bentonite, it does not remove all aluminum. |