**A bomb has exploded near a United Nations office in the Pakistani capital, Islamabad, officials say.**A foreigner is said to be among at least three people killed in the blast, near the World Food Programme offices.
Last week at least 16 people were killed in two suicide car bomb attacks in north-western Pakistan.
Correspondents say a string of recent bomb attacks show the Taliban appear to be reasserting themselves after a series of setbacks.
‘Timed bomb’
“It was a bomb blast, we are checking if it was a suicide attack,” Tariq Mehmood, a police official at the emergency response department, was quoted by news agency AFP as saying.
At least three people were killed and six injured, senior police official Tahir Alam told the BBC outside the WFP offices.
At least one of those killed was a foreign national, he said.
The official also said the explosion appeared to have been caused by a timed bomb planted in the basement of the offices.
A BBC correspondent says dozens of people are now outside the offices as the incident unfolds.
This is said to be the most serious attack in least three months to take place in the city, and security has been tightened across Islamabad.
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