Police exchanged fire with a group of gunmen near Leonardo Da Vinci international airport Saturday and arrested three members of an organized crime family after an intensive air and ground search, authorities said.

The shootout took place near the radar installation of the Leonardo Da Vinci international airport, at Fiumicino, 12 miles west of Rome. Police were patrolling a road near the airport's perimeter fence at about 2:30 p.m. when one of the gunmen opened fire on them with a Soviet-made Kalashnikov assault rifle. No injuries were reported.Police in Rome are on alert for possible terrorist activity, but they said the men arrested were "common criminals" belonging to a Mafia-type crime syndicate active in the Ostia Lido district near the airport.