(Adds U.S. passport found at site)
PESHAWAR, Pakistan, Sept 3 (Reuters) - A suicide bomber in a vehicle killed two Pakistanis and seriously wounded two foreigners in the Pakistani city of Peshawar on Monday, police said.
The officials said the bomber rammed into another vehicle in an area of the city, near the Afghan border, where foreigners live.
There was no immediate claim of responsibility for the attack, which a police officer said took place near a building occupied by a United Nations agency.
A police official said authorities had not determined the nationalities of the injured foreigners. But he said an American passport was found at the site of the blast.
Pakistan's Taliban, who are close to al Qaeda, are blamed for many of the suicide bombings across Pakistan, a strategic U.S. ally. (Reporting by Jibran Ahmad; Editing by Nick Macfie)