New York Mayor Michael Bloomberg and the city's police commissioner Ray Kelly are speaking in response to claims the Boston Marathon bombing suspects planned to detonate bombs in Times Square.
More top news
The Prime Minister will make a direct pitch to Scottish unionists on her first trip of the election campaign north of the border.
Headteachers warn that the education system is facing a "real risk it will break".
Prince Harry will join rugby fans at Twickenham Stadium to cheer on the Army as they take on their Royal Navy rivals on Saturday.