Pakistan's military says its jet fighters have struck five militant hideouts in a northwestern tribal region bordering Afghanistan, killing at least 21 insurgents.

The military said in a statement that Thursday's airstrikes were carried out in the Tirah valley in Khyber tribal region. It provided no further details.

Pakistan's air force often targets suspected militants and their hideouts in Khyber, and elsewhere in the country's northwest. The region is believed to be a hiding place for Pakistani Taliban and foreign militants.

The latest strikes came a day after a suicide bomber targeted a meeting of anti-Taliban elders in the Khyber region, killing five people.

Pakistan's army is also carrying out a major operation against militants in North Waziristan tribal region, to the south of Khyber.