The two Muslims the Brits captured the other day were probably intending to use sarin in a train carriage:

Terrorists were planning a chemical attack in London similar to that on the Tokyo subway, police and the security services said.

MI5 agents suspect that al-Qaeda sympathisers intended to produce a nerve agent – probably sarin – and release it in a confined space, such as a train carriage, to maximise the number of casualties.

Just in case you don’t know about sarin:

Initial symptoms following exposure to sarin (and other nerve agents) are a runny nose, tightness in the chest and contraction of the pupils. Soon after, the victim has difficulty breathing and experiences nausea and drooling. As the victim continues to lose control of bodily functions, he vomits, defecates and urinates. This phase is followed by twitching and jerking. Ultimately, the victim becomes comatose and suffocates in a series of convulsive spasms.

Sarin is a highly volatile liquid. Inhalation and absorption through the skin pose a great threat. Even vapour concentrations immediately penetrate the skin. People who absorb a nonlethal dose but do not receive immediate appropriate medical treatment may suffer permanent neurological damage.

Even at very low concentrations, sarin can be fatal. Death may follow in one minute after direct ingestion of about 0.01 milligram per kilogram of body weight if antidotes, typically atropine and pralidoxime, are not quickly administered. Atropine, an acetylcholine inhibitor, is given to treat the physiological symptoms of poisoning. Pralidoxime can regenerate cholinesterases if administered within approximately five hours.

It is estimated that sarin is more than 500 times as toxic as cyanide.

Death from 10 micro-grams per kilogram of body weight.  A 110 pound person (women and children would likely be on the train carriage) would have to ingest less than 1/2 of a milligram.  A baby aspirin is 81 milligrams–over 160 times as massive as a lethal dose of sarin.

And the Muslims want the British people to trust them?  When they start turning in people planning atrocities such as these then the trust can be slowly restored.