In yet another attack on Pakistani armed forces, two suicide bombers blew themselves up in the premises of a prestigious naval college on Tuesday, killing seven people and injuring over 20.The attack on the War College, one of Pakistan Navy’s key training establishments, was carried out by two suicide bombers, Interior ministry spokesman Javed Iqbal Cheema told a news briefing in Islamabad. The Punjab provincial government said seven persons were killed but did not give their identities. Security was stepped up across the country, especially at vital military installations, following the attack. The attackers, who were riding a motorcycle, apparently tried to follow a vehicle from the War College into the facility’s parking lot.One bomber blew himself up at the gate when the motorcycle was stopped by security personnel while the other detonated his explosives within the parking lot, triggering several blasts in the CNG tanks of the vehicles parked in the area, city police chief Malik Iqbal said.Witnesses said they first heard two blasts that occurred almost simultaneously a little after 1 pm local time. These were followed by two more blasts after a gap of a few minutes.President Pervez Musharraf, caretaker Prime Minister Mohammedmian Soomro and Pakistan People’s Party Co-chairman Asif Ali Zardari condemned the terrorist attack on the War College.