2017 also found the Met involved in countering and investigating terror attacks in Westminster (in which PC Keith Palmer was killed) and on London Bridge and Borough Market, as well as its officers using riot shields to protect firefighters from falling debris during the Grenfell Tower fire. The devastating fire led to an extensive forensic and criminal investigation involving around 250 Met officers. Commander Stuart Cundy said "I would like to reassure everybody that we will be looking at all criminal offences that might have been committed by any individual or any organisation." In 2018, its Counter Terrorism Command led the investigation into a chemical agent incident in Salisbury, Wiltshire, in which two couples were hospitalised over the course of three months.