Mayor of London Boris Johnson (2-R) arrives at a police cordon in Woolwich, London on May 23, 2013, at the site of the murder of a soldier by two suspected Islamists. Prime Minister David Cameron ... more 

Mayor of London Boris Johnson (2-R) arrives at a police cordon in Woolwich, London on May 23, 2013, at the site of the murder of a soldier by two suspected Islamists. Prime Minister David Cameron vowed on Thursday that Britain would be resolute against violent extremism following the gruesome murder of a soldier by two suspected Islamists on a London street less