Police in northwest Pakistan say a suicide bomber has struck near a market, killing at least 18 people and wounding more than 30.
Authorities say the attack happened Wednesday in the town of Kohat.
Police say the bomber blew himself by a passenger bus near Tirah market. Officials say the bus was headed to nearby Orakzai district.
No one has claimed responsibility for the blast.
Meanwhile, a purported spokesman for the Pakistani Taliban has claimed responsibility for a deadly blast that took place Monday during an anti-Taliban meeting.
In that attack, two suicide bombers blew themselves in Mohmand near the Afghanistan border, killing 50 people.
The Pakistani army has been fighting insurgents in the area but has been unable to defeat Taliban and al-Qaida linked groups.
Some information for this report was provided by AFP and Reuters.