Police calm London, but riots flare across UK

Thousands of extra police officers flooded into London Wednesday in a bid to end Britain's worst rioting in a generation. An eerie calm prevailed in the capital, but unrest spread across England on a fourth night of violence driven by diverse and brazen crowds of young people.

Scenes of ransacked stores, torched cars and blackened buildings frightened and outraged Britons just a year before their country is to host next summer's Olympic Games, bringing demands for a tougher response from law enforcement. Police across the country have made more than 1,100 arrests since the violence broke out over the weekend.

In London, where armored vehicles and convoys of police vans patrolled the streets, authorities said there would be 16,000 officers on duty — almost triple the number present Monday. They said a large presence would remain in the city through the next 24 hours at least.

The show of force seems to have worked.