The bomb
AMERICAN
analysis of residues found in the wreckage indicates that the
bombers used C-4, a military plastic explosive which has no
non-military uses and is not available on the open market..
To some experts, this suggests the
involvement of a state, or at least a well-organised group. C-4
was developed for the US in the Vietnam era. It has been sold by
the US to Saudi Arabia, Kuwait and Iran (under the Shah), and
several Nato countries possess it. The US also used it in the 1991
Gulf war.
The formula for C-4 is not secret,
and quantities have occasionally been stolen. About 20 years ago,
a former CIA agent was convicted of shipping 21 tons of C-4 to
Libya - allegedly for terrorist training.
C-4 does not deteriorate with age,
so the explosives used in the Aden bomb
could, conceivably, have been stolen at any time since the Vietnam
war.
It is possible that further
analysis may indicate where the explosive was manufactured and
thus open up a line of investigation into how the bombers obtained
it.
It is, perhaps, worth noting that
the 1998 bombings of the US embassies in Tanzania and Kenya, for
which Osama bin Laden has been blamed, did not use C-4 explosives,
though they used detonators containing the C-4 component, RDX.
It is thought that the bombers
used 400-700 pounds of explosives. This is a large amount to
conceal aboard an inflatable. Although no details of the size and
type of craft used have emerged so far, the bombers seem to have
had trouble keeping it afloat during a test run (or previous
bombing attempt) in January.
The choice of C-4 indicates that
the bombers had a reasonable level of expertise, because ordinary
or home-made explosives would have been less effective. But it
takes no more than a quick search of the internet to discover that
if you want to blast a hole in metal - tanks, ships, etc - C-4 is
the explosive to use.
The shape of the USS Cole, with
its sides bending outwards, and pictures of the damage, show that
the force of the blast was directed both sideways and upwards. It
was not the sort of attack that is expected in modern warfare -
which may also help to explain the extent of the damage.
According to Paul Beaver, of
Jane's Defence Weekly, the ship was "designed to withstand
saturation attacks by Russian aircraft and all sorts of
things," but "not designed for asymmetrical warfare …
it's not what people expect these days."
Yemeni sources say the attack on
the USS Cole was not the first attempt to blow up an American
warship in Aden harbour. An attack on the American destroyer, USS
Sullivans, in January 2000 had to be abandoned because the
attackers' boat almost sank under the weight of explosives (AP 11
November, CNN 12 November). It appears that as a result of this
the bombers called on an unnamed foreign expert for advice, and
that the expert may have helped to shape the charge used against
the Cole, maximising its effect.
|