ISLAMABAD, Pakistan — A suicide attack on a vehicle possibly carrying foreign nationals killed two people and injured another 19 in Pakistan’s northwestern city of Peshawar.

Senior city police official Imtiaz Altaf confirmed the number of deaths in comments made Monday to reporters. The Associated Press reported that those killed were Pakistanis, while local broadcaster Geo television said Americans may have been among the fatalities.

The blast, in an area that’s also home to United Nations offices, badly damaged two vehicles and nearby power pylons, television footage showed. Channels broadcast images of a overseas passport found at the site of the attack.

The US embassy in Islamabad is investigating the incident, a spokeswoman who declined to be named said when reached by phone.

Taliban guerrillas, who oppose the country’s alliance with the US and are fighting Pakistan’s army in tribal regions near Peshawar, bombed a US Consulate vehicle in the city on May 20 last year killing two people and injuring 10, including two Americans.

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