Suspected Islamic militants have detonated three bombs in northwestern Pakistan near the Afghan border, killing at least seven people and wounding four.
A local police chief, Dar Ali Khattak says three policemen, three paramilitary soldiers and one passerby were killed when a bomb tore through a police van in the town of Dera Ismail Khan.
A few hours later, a second bomb went off near the site of the first blast, damaging the wall of a government building but injuring no one.
Later in the evening, another bomb exploded near a police station in the city's center, again causing material damage but no injuries.
No one has claimed responsibility for the blasts, but the police chief said militants from a neighboring tribal region could be behind the attack.
Dera Ismail Khan is close to the restive South Waziristan tribal region, where security forces have been battling al-Qaida-linked militants and their local allies for the past two years.
Pakistan's army has conducted a series of counter-terrorism operations in North and South Waziristan in the past three years, aimed at trapping Arab, Afghan and Central Asian militants with links to the Taleban and al-Qaida.