Kabul

"Clashes are ongoing and the area is cordoned off by the Afghan security forces," said Kabul police spokesman Hashmat Stanikzai. An official at the scene requesting anonymity confirmed the attack.

Several gunmen were firing on a training facility overseen by the National Security Directorate -- Afghanistan's intelligence agency -- from a nearby construction site according to officials.

There was no immediate claim of responsibility for the attack.

The attack comes hours after a suicide bomber detonated explosives inside an education centre in western Kabul, where students were studying for college entrance exams, killing at least 37 people.

It was the latest incident in a blood-soaked week that saw militants deliver crippling blows to government forces across Afghanistan.

The school bombing underscored the price that ordinary Afghans have paid in the grinding conflict as the country reels from a recent uptick in violence, including a massive, days-long Taliban onslaught on the eastern city of Ghazni.

Afghan forces appear to have finally pushed Taliban fighters from the strategic provincial capital.

Small pockets of the city began opening up to humanitarian aid today, while partial mobile service returned after telecommunications infrastructure and government buildings were destroyed during the fighting.

The surge in violence comes weeks after Afghans marked an unprecedented country-wide ceasefire between the Taliban and government forces in June, giving some relief to civilians.

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