LONDON (AP) _ Police arrested two men Monday in connection with IRA attacks on Heathrow Airport in 1994.

The arrests came during early morning raids in west London, Scotland Yard said.

The men were being held under anti-terrorism laws at a central London police station, where they were being questioned about the attacks, said a spokesman, speaking on condition of anonymity.

Although armed officers were involved in the raids, no shots were fired and no one was injured, he said.

Irish police, meanwhile, released one of six men arrested Sunday after police uncovered a suspected IRA arms cache on a remote farm in northwest Ireland. Police said they found further explosives on the property Monday.

The five men still in custody are from Northern Ireland and have links with the IRA.

The IRA fired a dozen mortar bombs at Heathrow Airport in three attacks within days of each other in March 1994. None exploded, but services at Heathrow were severely disrupted.

The Irish Republican Army ended a 17-month cease-fire on Feb. 9 with a bombing in London that killed two men and caused millions of dollars worth of damage.

This month, the IRA renewed its armed campaign in Northern Ireland with a double bombing at the British army's main barracks that killed a soldier and injured 30 other people.