Pakistan army's helicopter gunships have killed a number of foreign militants, in a night time strike on their compound in a tribal area bordering Afghanistan, a military spokesman said on Wednesday. Major-General Shaukat Sultan told Reuters: "The operation was successful. It is now over. We have confirmed reports that a few foreign militants were killed in the compound, but details are still coming."The military used Cobra helicopter gunships in Wednesday's attack on the hideout in a village called Nagar, 6km south of Miran Shah, the main town in North Waziristan. The attack occurred at around 11.15pm (1815 GMT), and the helicopters were ordered into the air after the military received information about the presence of foreign fighters, Sultan said. The army has used artillery and helicopter gunships to quell pro-Taliban tribals and around 250 people have been killed since early March.