A suspected US missile attack has targeted a Taleban base in north-west Pakistan, say local security officials.
The attack targeted militants in the South Waziristan tribal region, close to the Afghan border, they said.
Unconfirmed reports say three people were killed and five injured in the attack in an area said to be the base of top militant Baitullah Mehsud.
It comes a day after a suicide car bomber killed 27 people in an attack on a police checkpoint in the north-west.
The Pakistani Taleban claimed responsibility for the blast near the town of Hangu.
The US - which has been blamed for a number of attacks along Pakistan's border areas recently - has not confirmed Sunday's strike.
"It was a drone attack," local administration official Shahab Ali Shah told AFP news agency.
South Waziristan is a haven for Taleban and al-Qaeda fighters who enter Afghanistan to fight US and Nato forces, say correspondents.
Washington says it acts only when it has clear intelligence on the whereabouts of a known militant and that the strikes help prevent terrorist attacks.
But Pakistanis complain that civilians are often killed and that the strikes are a violation of their sovereignty.