Hundreds of people also attended a candlelit vigil in Birmingham overnight for the three men. A 32-year-old man has been arrested on suspicion of murder following the incident.
“We needed a fightback and a fightback is under way,” Cameron said in a somber televised statement outside his Downing Street office after a meeting of the government’s crisis committee.
He said “nothing is off the table” — including water cannons, commonly used in Northern Ireland, but never deployed in mainland Britain.
Senior police officers, however, indicated they had no plans to use water cannons.
The violence has revived debate about the Conservative-led government’s austerity measures, which will slash ￡80 billion (US$130 billion) from public spending by 2015.