A bomb exploded outside a London postal depot, three weeks after dissident Irish republicans struck the same site and days before Prime Minister Tony Blair was expected to call a general election.
The blast injured a passerby and blew out windows at the depot, which was empty at the time. It was the third bombing in six weeks in London. All have been blamed on the Real IRA, an Irish Republican Army splinter group.
Authorities said the blast may be linked to Saturday's 20th anniversary of the death of IRA hunger striker Bobby Sands in Northern Ireland's Maze prison.