The mandate of the UN investigation team restricts them to establishing
whether poison gas has been used – not who was responsible. After the
passage of five days, much of the evidence will have faded away. The
strongest residue left by sarin, VX or mustard gas usually disappears after
about 48 hours.
However, the inspectors under the leadership of Prof Ake Sellstrom, a Swedish
scientist, might still be able to gather soil samples and other forensic
evidence. This could allow them to identify which chemical agents were used
in the attack, a fact that might indirectly point the finger of blame. But
their mandate will not allow them to give a conclusive answer the central
question of who was responsible.
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