An Afghan policeman keeps watch at the site of a blast near Kabul University in Kabul, Afghanistan. Omar Sobhani/ Reuters
An explosion on Friday near a gate to the campus of Kabul University in the Afghan capital killed six people and injured at least 27 as students waited to take an examination, officials said.
Afghan security forces are facing almost daily attacks by Taliban militants, despite reported progress in efforts by the United States to broker an end to Afghanistan's nearly 18-year war.
There was no immediate claim of responsibility for Friday's blast just hours after Taliban militants set off two car bombs outside police headquarters in the southern city of Kandahar, killing at least 12 and wounding more than 80.
Health ministry spokesman Wahid Mayar said there were students among the 27 injured taken to hospital after the blast, which a student at the university campus said took place while a number of students waited to appear for an exam.
An eyewitness and an interior ministry official said a vehicle caught fire after the explosion caused by a sticky bomb, a common threat in Kabul, where insurgents often stick explosives under vehicles.
A police team defused a second bomb placed near the explosion site, Kabul police spokesman Faramarz Firdaws said.
The rush-hour explosion sent a plume of smoke into the air above the Puli Mahmood Khan neighbourhood of the Afghan capital and shook buildings up to two kilometres (1.2 miles) away, with the media reporter saying he could hear gunshots after the blast.
A plume of smoke rose over central Kabul shortly after midnight and sirens could be heard. Inside the embassy, employees heard this message over the loudspeaker: "An explosion caused by a rocket has occurred on compound."
Green Village is separate from the nearby Green Zone, a walled-off and heavily fortified part of Kabul that is home to several embassies including the US and British facilities.
About 30 trailers and Hummers carrying heavier duty equipment crossed, with troops in cars coming through, the source added. A second security source in Mosul also said US troops had crossed into Iraq from Sahela.
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