Three traffic police officers were killed on Sunday morning when a group of suicide bombers infiltrated and seized a government agency building and begun shooting with security forces in eastern Afghanistan's Khost province, provincial police chief said.

"There appeared to have been three to four suicide bombers armed with rifles inside the traffic police department, so far I can confirm three traffic police officers were killed," Abdul Hakim Ishaqzai told Xinhua.

He also said three others people were injured in the gunshots that begun at around 4:30 a.m. local time in Khost city, the capital of Khost province.

The police chief also said police forces and army commandos have been deployed in the area to capture or kill the militants.

The area is cordoned off by the police and army and military helicopters of NATO-led forces were hovering over the area to monitor the situation.

According to local residents a suicide car bomb went off in front of the building before the militants stormed the building.

Sunday morning's attack is the second massive attack since Saturday in the country.

Six people were killed and 23 others injured when a suicide bomber infiltrated and blew himself up inside the country's biggest military hospital in capital city of Kabul on Saturday.