All the attackers were killed by the security forces while fresh contingents of police were rushed to the site, and a subsequent search operation was launched, officials said.
A suicide bomber blew himself up near a vehicle of Pakistan's security forces close to a nonfunctional airport in the country's restive Khyber Pakhtunkhwa province on Thursday but did not cause any casualties, an official said.
Following the suicide bomb blast at Karachi university where three Chinese nationals were killed, China asked Pakistan on Tuesday to arrest the culprits responsible for the attack.