A bicycle bomb exploded in Taliban hotbed Helmand's provincial capital Lashkar Gah, killing seven civilians and injuring 14 others on Tuesday morning, police said.

"The bomb planted on a bicycle and detonated by a remote control in Lashkar Gah this morning, leaving seven innocent civilians dead and injured 14 others," police chief in the province Assadullah Shirzad told Xinhua.

He put the attack on the enemies of peace, a term used against Taliban insurgents. However, the militants have yet to make comment.

Spokesman for provincial administration Daud Ahmadi also confirmed the casualties.

The bloody incident occurred while a major Afghan-NATO forces' operation with the involvement of 15,000 troops has been going on against Taliban fiefdom in Marja district of Helmand province.