LONDON (AP) _ A magistrate refused bail Monday for a 52-year-old unemployed man charged with abducting a driver and blowing up his cab near the prime minister's Downing Street office.

The Arbour Square magistrates court remanded Patrick Oliver Murphy of London into custody for nine days on charges of causing an explosion and abducting a man.

The Irish Republican Army claimed responsibility for the Oct. 30 blast. Police are not divulging details about Murphy's background or alleged involvement, said a Scotland Yard spokeswoman who declined to be named.

Murphy's attorney, Gareth Pierce, said her client was the ''subject of mistaken identity.''

Murphy has been in custody at the top-security Paddington Green police station under the Prevention of Terrorism Act since Wednesday.

No one was injured in the explosion last fall, and Prime Minister John Major was not in his office at the time. Police said at the time that two men hijacked the cab, but only Murphy has been arrested.

The IRA is waging a campaign to drive the British out of Northern Ireland and unite the province with the Irish Republic.