Four policemen were killed, seven others were injured Thursday in a remote-control bomb explosion in Afghanistan's southern province of Helmand, a local official said Friday.

"Last night a bomb explosion happened in a police post in Hasht area of Hazarjuft district, which killed four policemen and injured seven others," Haji Bahadir Khan, the district police chief told Xinhua.

The police chief blamed Taliban for carrying out the explosion, and said they installed the bomb when the police were out and launched the explosion afterwards.

Helmand, together with Zabul, Kandahar and Uruzgan, the former stronghold of Taliban, has become the hotspot of militancy this year.

Two suicide attackers were killed Thursday when bombs installed on their bodies exploded in southern province of Kandahar.

More than 1,500 people, with the majority of them rebels, have been killed in Taliban-linked militancy since the beginning of this year.

Source: Xinhua