Pakistan has increased security at all of its airports to prevent possible terrorist attacks following a recent escalation of violence in the country.
Airport security officials called for "high vigilance" at area airports Monday as they tightened passenger screening and security checks.
Officials say the heightened security measures follow a suicide attack on a military training facility in the northwestern town of Dargai Wednesday.
Officials say the blast killed 42 soldiers in the deadliest attack on the military since troops began waging a counterinsurgency along the Afghan border.
Officials say the attack was in revenge for a military airstrike on a religious school in October. The army says the 80 people killed in the raid were militants, but local tribesman say the victims were innocent civilians.
On Sunday, India also increased security at its airports after the U.S. Federal Bureau of Investigation (FBI) alerted Indian officials to a possible terror threat to U.S.-bound flights out of several major Indian airports.
Some information for this report was provided by AFP, AP and Reuters.