At least four people have died and 19 others have been injured due to a suicide attack on a vehicle that left the U.S. consulate in the northern city of Peshawar Pakistan.
One of the two dead and several injured are foreigners but police sources have avoided specifying the nationality of the victims.
The local television channel Geo has shown shortly after the attack that killed one American.
However, a source at the U.S. embassy has denied that U.S. citizens were among the dead.
"Two U.S. officials and two workers were injured Pakistani Consulate. Consulate No Americans died (in the attack)," has pointed out in a statement released shortly after noon by the U.S. Embassy in Islamabad.
The Information Officer of the province of Khyber Pakhtunkwa, Mian Iftikhar, told the media that after the explosion a team of U.S. embassy appeared to pick up American casualties.
"We can not know if those people were injured or killed," said Iftikhar.
Several local media have raised to five the number of deaths by suicide action, which took place close to a UN office in Peshawar, the main town in the northwest of the South Asian country.
This city of about 3 million inhabitants is the capital of the northwestern province of Khyber-Pakhtunkhwa, surrounding tribal areas bordering Afghanistan.
These areas, which have never been under full control of the State, provide shelter to Taliban factions, jihadist groups and members of al Qaeda, and are among the most violent in Pakistan.