Facing unending rioting that has spread to other cities, London deployed 16,000 police in the largest show of force in the city's history. British Prime Minister David Cameron cut short a holiday in Italy to return home to deal with the widening crisis. Army units are standing by to help restore order. To date, 563 people have been arrested, and over 100 police officers injured. Collected here are images of the rioting and efforts to clean up the destruction. -- Lane Turner ( 25 photos total