Attack on Downing Street
On February the 7th, 1991, the Provisional IRA mounted a Mortar attack on No 10 Downing Street.
The original plan was to assassinate Margaret Thatcher but, by the time PIRA had planned and set up the attack, she had resigned and the Premiership had passed to John Major. PIRA decided to godhead with the attack regardless. The PM was meeting with his War Cabinet to discuss the Gulf War when at 10.08 the attack went in.