Police are still exchanging fire with at least one gunman holed up in an unfinished high-rise building overlooking the diplomatic quarter. Six people have been killed and 16 injured, Kabul’s police chief said.

The Taliban said they were behind the violence.

At least one attacker remains on one of the upper floors of the building, says the BBC’s Quentin Sommerville, in Kabul.

Afghan intelligence officials are already going through the lower floors, gathering evidence about the way the attack was planned and carried out.

Two of them told the BBC they found rocket-propelled grenades (RPGs), heavy machine guns and hand grenades, as well as biscuits and energy drinks.

“They had planned a long battle,” one official said.

Counter-terrorism officials said they recovered three mobile phone Sim cards from the bodies of attackers killed earlier in the day. The records showed the numbers had been used for calls to and from Pakistan, they told the BBC.

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