A team of detectives are to fly to Libya as part of the investigation into the murder of Wpc Yvonne Fletcher in London 20 years ago.
Wpc Yvonne Fletcher was killed on 17 April 1984
She is thought to have been shot by a gunman inside the Libyan embassy as she helped control a protest against Libyan leader Colonel Gaddafi on 17 April 1984.
BBC News Online details the events and developments in the police investigations since her death.
17 April 1984: Wpc Fletcher is killed and 10 people injured after shots are fired from the Libyan People's Bureau in central London.
A siege begins as the embassy building is surrounded by specialist police offers.
Diplomatic links with Libya are brought to an immediate end.
27 April 1984: The siege ends after 10 days when 30 Libyan diplomats, including the gunman, make their way out of the embassy in single file.
All are granted diplomatic immunity, effectively stopping any police investigation into the death of Wpc Fletcher.
7 July 1999: The Libyan government accepts "general responsibility" for the shooting of Wpc Fletcher and offers to pay compensation to her family.
8 July 1999: Scotland Yard announces it is to reopen the investigation into the death of Wpc Fletcher.
2 May 2002: Scotland Yard officers fly to Libya as part of the investigation into Wpc Fletcher's death but return with no real leads to follow.
10 February 2004: The Metropolitan Police Federation says Libya has "blood on its hands" over the officer's death and demands that the Libyans should hand over the killer before Tony Blair has talks with Colonel Gaddafi.
25 March 2004: On the same day that Tony Blair meets Colonel Gaddafi in Libya, Foreign Secretary Jack Straw announces that Met Police officers will fly there on 3 April in a fresh attempt to find Wpc Fletcher's murderer.