British police say they have received a coded bomb threat from Irish Republican militants on the eve of Queen Elizabeth's historic visit to Ireland.
Scotland Yard officials said Monday the bomb threat related to central London, but did not include a specific time or place. Coded warnings have been a trademark of Irish dissidents.
Police closed off an area close to Buckingham Palace for several hours on Monday. Security officers were seen inspecting a dislodged manhole in central London.
Bomb disposal experts also blew up an abandoned suitcase in a controlled explosion.