UK Dirty Bomb ?

police in the UK have arrested two brothers in connection to an alleged plot to detonate a chemical weapon. the two suspects are 23 year old mohammed abdul kahar who is recovering in hospital after being shot during the arrest and his brother 20 year old abul koyair who is in police custody as well. both men are from bangladesh. the police had reliable intelligence that the device could cause casualties in the double or triple digits. police were also seen scouring the surrounding neighbourhoods for the chemical device while wearing chemical and bio protective suits, so far they have not been succesful in finding any such device.