The Prime Minister has said armed police need "clarity" about the legal powers they have as he backed a Home Office review after an officer was charged with the murder of Chris Kaba.Scores of Metropolitan Police officers stood down from firearms duties following the charge against one of their colleagues.Cover has been drafted in from neighbouring forces and the military could be used in the event of a terror attack, but soldiers do not have the authority to be used in routine policing.

The Prime Minister has said armed police need "clarity" about the legal powers they have as he backed a Home Office review after an officer was charged with the murder of Chris Kaba.Scores of Metropolitan Police officers stood down from firearms duties following the charge against one of their colleagues.Cover has been drafted in from neighbouring forces and the military could be used in the event of a terror attack, but soldiers do not have the authority to be used in routine policing.