Two suicide bombers were killed on Monday in front of a government agency building in Lashkar Gah, capital of Afghanistan's Helmand province some 555 km south of capital city of Kabul, a provincial administration spokesman said.

"Two suicide bombers had the intention of attacking a provincial court office in Lashkar Gah at around 11:30 a.m. local time, but police identified and intercepted the bombers," Daud Ahmadi told Xinhua.

He said the first bomber blew himself up after intercepted by police triggering an explosion that killed the bomber and injuring two civilians and a policeman on the scene.

According to Ahmadi, the second bomber was shot dead by police force before he had the chance to detonate his explosive vest.

No group has claimed responsibility for the attack so far, but Taliban militants have been behind most suicide and roadside bomb attacks across the war-ravaged country.

Notorious for growing poppy and militancy, the Helmand province has been regarded as Taliban hotbed in southern Afghanistan.