POLICE in the Irish Republic believe they have foiled a plan to re-start a terrorist campaign in Northern Ireland, with the capture of four known gunmen with a large cache of arms. The terrorists are all known members of the outlawed Irish National Liberation Army (INLA), an extreme nationalist group which refused to join the IRA and loyalist paramilitaries in an announcement of a cease-fire last year. A small-but-ruthless terrorist group which split away from the IRA many years ago, its victims have included the Tory MP Airey Neave whose car was blown up inside the grounds of the House of Commons. It has come under intense scrutiny from security forces both north and south of the border since the cease-fires. The men, in a car and a van, were arrested north of Dublin after a police chase early yesterday. One of them was last year named as the group's Chief of Staff. The police threw stun grenades at the vehicles but no shots were fired. They discovered 26 guns and rifles along with 2,000 rounds of ammunition. Senior police officers in Dublin were relieved they had stopped the INLA taking weapons into the north. Many of the rifles were newly-imported into Ireland and some had instruction manuals - a sign the group had been re-equipping itself. It is thought the INLA team may have been planning an attack to mark the anniversary of the Easter Rising against the British in Dublin. The INLA has not mounted any attacks in Northern Ireland.