In 1974 the IRA exploded a bomb at the Houses of Parliament, causing extensive damage and injuring 11 people. The IRA said it planted the 20 lb device which went off at about 8.30 local time, in a corner of Westminster Hall.
A 17-year-old boy has been shot and killed in north London.
Sharmaake Hassan was found in Gilbeys Yard, Camden, at about 2300 BST on Saturday with a gunshot wound to the head, said the Metropolitan Police. He was taken to hospital with severe injuries and died on Wednesday night.
No-one has yet been arrested for the murder. Sharmaake is the 15th young person to die in London since the start of the year.