Afghan policeman in Kabul
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Kabul office worker caught in gunfight

A suicide bomb and gun attack is ongoing in the centre of the Afghan capital Kabul, with a string of blasts targeting the US embassy and Nato's Isaf headquarters.

Gunmen are holed up in a partly-built high-rise building nearby, exchanging sporadic gunfire with police.

The Taliban say that they are behind the attack.

Eyewitness Himanshu Sharma told the BBC's Jane Hill he was trapped at his workplace because of heavy gunfire that has surrounded his office for hours.

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