According to a report in The Independent, Hamish de Bretton-Gordon, a former commanding officer at the Joint Chemical Biological Radiological Nuclear Regiment has said that ISIS militants who have undergone brief training with the ISIS in Iraq and Syria are capable of launching such attacks.
Gordon said that the use of chemical weapons has gone up in the past two weeks in Iraq and Syria and that jihadis have been trained to use chlorine as a weapon.
He fears that chances of a chlorine attack are high especially during a football match or in the train or tube.
Reports suggest that ISIS militants had last year taken over a huge chlorine factory in Mosul.
Many youth from UK have travelled to Syria and Iraq showing support towards the ISIS.