Met Commissioner Bernard Hogan-Howe has said there will be increased searching and more officers on the beat for the London Marathon following the events in Boston.
He added that the force were taking any potential link to the London Marathon seriously but there were no obvious ones at the moment. He has also been in touch with his American counterparts.
More top news
Read the letter carefully, don't worry, it's short. Note that while it praises the Conservative-led government it does not mention Labour.
Most children are happy to let their teeth come out naturally but for one Florida boy, a little extra horsepower was called on.
Travellers hoping to get away for the Easter weekend are being warned of potentially serious problems on the road and rail networks.