Militants attacked Sunday a Pakistani air base in Karachi, killing four people, said a spokesman for Pakistani naval forces.
According to the Express television channel TV, five explosions were heard on the Naval Air Station.
Officials of the intelligence services have said that between 15 and 20 attackers were inside the base of Mehran and had attacked three aircraft hangars.
Witnesses reported gunfire and saw smoke rising from buildings.
"We have four dead and five wounded, but the balance may go up," he told Reuters an official security services, who requested anonymity.
Images on television, we can see flames and smoke rising from the site.
The Pakistani Taliban have vowed to avenge the death of Osama bin Laden, killed May 2 in Pakistan by American special forces.
