The militants opened indiscriminate fire on a security post located at the ASF academy in Bitai Abad, near the Jinnah International Airport which had been cleared of militants after fierce clashes between forces and terrorists yesterday.
The army's press wing said there were three or four attackers on motorbikes while an ASF spokesman said there were two.
"Two people came towards the ASF (Airport Security Force) checkpost and started firing," Colonel Tahir Ali, a spokesman for the ASF told reporters.
Army spokesman Major General Asim Bajwa said three to four assailants were involved.
"3-4 terrorists fired near ASF camp, ran away. No breach of fence, no entry. Chase is on, situation under control," he tweeted.
Airport operations were resumed after temporarily being suspended for the second time in as many days.
The attackers failed to penetrate the security cordon and managed to flee into nearby congested residential areas.
The ASF spokesman said the incident had been played up and dismissed reports about five terrorists entering the base camp and engaging the security forces.
"The Pakistan army is also carrying out surveillance from helicopters and the situation is under control. The Jinnah international airport is in control of the authorities," he said.
A spokesman for the Pakistan International Airlines said flight schedule had been disrupted as passengers and visitors to the Jinnah airport were evacuated to safe locations after the attack at the ASF camp this morning.
Tehreek-i-Taliban Pakistan (TTP) claimed responsibility for the attack.
