“Britain’s domestic spy agency MI5 is tracking a number of terrorism plots against the U.K., despite successes in curbing the threat from extremists since deadly attacks on London’s transit network five years ago, an official said Wednesday.

Prime Minister David Cameron marked the fifth anniversary of the July 7, 2005, suicide bombings on three subway cars and a bus, sending a wreath and handwritten note to be laid at a memorial to the 52 commuters killed in the attack.

‘It was a dreadful day, but it is also a day that will remain, I believe, a symbol of the enduring bravery of the British people,’ Cameron told the House of Commons.”

(Source: The Associated Press: Britain marks 5th anniversary of terror attack)