At least three persons - a foreigner and two women - were killed and several others injured on Monday in an explosion at the office of a UN agency in a high-security area in the heart of the Pakistani capital, police said.

The blast occurred inside the World Food Programme (WFP) office in Sector F-8. Deputy Inspector General of Police Bin Yamin told reporters that two Pakistani women employees of the WFP were killed while other police officials said the body of a foreigner had been taken to a nearby hospital.