(CNN) -- Police in Northern Ireland arrested a 19-year-old man Thursday morning in connection with the killing last month of two British soldiers, a police spokeswoman said.
Comrades carry the coffin of sapper Mark Quinsey in Birmingham, England, on March 18.
Police did not release his name. One other person has been charged in the case.
The March 7 shooting at the base in Massereene, Northern Ireland, was the first fatal attack on British soldiers in the province in more than 12 years, and it sparked fears of a return to the sectarian violence that Northern Ireland suffered until the Good Friday Agreement of 1998, a period known as "The Troubles."
Cengiz "Pat" Azimkar, 21, and Mark Quinsey, 23, were killed in the attack, which came as pizzas were being delivered to the base barracks. Two other soldiers and two pizza delivery men were wounded.
The Real IRA, a militant group that splintered away from the Irish Republican Army, reportedly claimed it had carried out the attack.
Two days after the attack on the soldiers, Constable Stephen Carroll, 48, was shot as he responded to a call in the town of Craigavon, in County Armagh.
News reports said he was shot in the back of the head.
Three people have been charged in connection with his death. Two men, 37 and 17, have been charged with murder, and a 21-year-old man is charged with withholding information connected to the murder, the Police Service of Northern Ireland said.
Another militant splinter group, the Continuity IRA, claimed responsibility for Carroll's killing.
Neither splinter group accepts the Good Friday accord of 1998 that ended direct London rule of Northern Ireland and created a power-sharing government.