Shortly before dawn this morning, there was a police anti-terrorism raid on a house in East London. During the raid a man was shot (and not killed) by police.
More interestingly, there are around 100 police officers there who have closed off several nearby roads, and all of them seem to be wearing chemical protective suits and carrying (though not wearing) respirators.
I wonder what has been prevented, I am sure we will find out.
You will find the most recent reports on BBC News.