A new report says that ISIS is training terrorists in Britain via video conference to carry out chemical weapons attacks on trains and other public transportation systems.

“I am convinced that IS (another name for ISIS) fighters are all being given training in chemical weapons and the British ones, who are likely to be more educated, will all be targeted in the hope they may return home,” said Colonel Hamish de Bretton-Gordon, the retired head of chemical and biological weapons for the British Army, according to the Mail Online.

The Colonel said that because of British laws, people can obtain large amounts of chlorine without a license, so the bomb could be a chlorine weapon.

“They will have a reasonable idea on how to use chlorine and other toxic chemicals as a terror weapon,” he added.

“This could happen on a train or tube or even at a big football match. Acquiring weapons and ammunition is very difficult in the UK but you can get up to 90 tonnes of chlorine without any license.”

Chlorine can burn the lungs when present in the air in a concentrated amount.

“Chlorine is not very toxic and the green and yellow clouds are easy to see and avoid. It is very non-persistent only lasting for a few minutes. It was used in the First World War but dropped because it did not work very well,” he continued.

“It is key that ISIS don’t get the advantage of an unexpected chemical attack in the UK. If you can hold your breath for 30 seconds and run in the opposite direction you will be okay. If outside you should aim to climb or reach higher ground.”