Kabul, Mar 8 (IANS): At least two persons were killed and 12 injured when three explosions rocked a military hospital here on Wednesday.

The blast took place around 9 a.m at the Sardar Mohammad Daud Khan Hospital in Wazir Akbar Khan area, where several government agencies and embassies are located. It was followed by another explosion.

The third bombing came around 10.45 a.m. when army helicopters were hovering over the building.

At least five suicide bombers were involved in the attack, Xinhua news agency reported.

"I saw one of the suicide bombers who wore the doctors' uniform and opened fire. I managed to escape from the area," a doctor told TOLO News.

The injured were admitted to Wazir Akbar Khan hospital, Khaama Press quoted Ismahil Kawosi, a Health Ministry spokesman, as saying.

Afghan Crisis Respond Unit (CRU) forces were at the site and still engaged with the attackers, a security source said.

Meanwhile, the NATO-led Resolute Support coalition forces said they "stand ready to assist Afghan security services".

The 400-bed hospital, which is located in the diplomatic district near the US embassy, is the main and largest army hospital in the country.

No group has claimed responsibility for the attack.