At 2.53am on 12 October 1984, a bomb ripped through the Grand Hotel in Brighton during the Conservative party conference.
The IRA admitted the terrorist attack – an attempt to assassinate PM Margaret Thatcher and her Cabinet. She escaped unscathed, but five died and 34 were injured.
The bomb was planted by IRA explosives officer Patrick Magee. He was jailed for 35 years, but freed in 1999 under the terms of the Good Friday Agreement.