Terror checks intensify as London attack enters election fray

Britain has stepped up security after the London Bridge attack. [Photo: AFP]

Britain's Boris Johnson said Sunday he had ordered the security services to step up monitoring of convicted terrorists released early from prison, prompting accusations that he was exploiting the London Bridge attack for political gain less than two weeks before elections.

The prime minister revealed officials were scrutinising around 74 people with terrorist convictions who had been released early from prison-like Usman Khan, who left jail last December and went on to stab two people to death in Friday's rampage.