Six police were killed as a roadside bomb struck a police van in Taliban birthplace Kandahar in south Afghanistan on Monday, a local official said.

"Today at 10:00 a.m. local time a bomb planted by militants on a road in Khakriz district hit a police vehicle leaving six policemen dead," Abdul Qayum, the governor of Khakriz district told Xinhua.

Taliban militants who have intensified their activities have not made comment.

Militancy and conflicts have been on constant rise since beginning spring when Taliban outfit announced to launch spring offensive dubbed Al-Faath or victory.

A suicide attack carried out by anti-government militants in capital Kabul on Sunday claimed the lives of two civilians and injured more than 20 others.

The increase in attacks took place while Afghan government is hosting an international conference on the war-battered nation - the Kabul Conference with the participation of more than 70 countries and international organizations on July 20.