Gunmen launched a pre-dawn attack on a military academy in Kabul on Monday, security officials and sources said in an ongoing assault that marks the latest violence to strike the Afghan capital.

Some of the attackers at the Marshal Fahim Military Academy have been killed, an Afghan security source said, in the third major attack in the city in just over a week.

At least four attackers were still involved in an intense gun battle with security forces, the source said, adding the gunmen had not managed to enter the heavily fortified academy.

Three soldiers have been wounded, defence ministry spokesperson Dawlat Waziri said.

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"One bomber detonated himself and the rest of the attackers are resisting. They are under siege by our forces," Waziri added.

Witnesses said they heard several explosions and gunfire at around 05:00 (00:30 GMT) at the academy on the outskirts of Kabul where high-ranking military officers are trained.

Security forces have swarmed the area and blocked the road leading to the academy.

At least 103 people were killed and 235 wounded in Saturday's lunchtime attack - one of the worst bombings in the city in recent years - which was followed by a national day of mourning in the war-weary country.

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