Zakia Zaki, owner and manager of private Peace Radio in Jabbul Saraj, 60 kilometres north of the capital Kabul, was killed in her home late Tuesday, the ministry said.

The attackers have not yet been identified, ministry spokesman Zemarai Bashary told AFP.

"Her family has not blamed anybody for the death of Zaki and police have started an intense investigation of the case," he said.

Zaki, aged in her late 30s, was also a school headmistress and attended the 2003 meeting that drew up Afghanistan's post-Taliban constitution.

She was critical of "warlords" -- commanders of the anti-Soviet resistance during the 1980s who dragged Afghanistan into a brutal civil war, Afghan Independent Journalists Association president Rahimullah Samander told AFP.

The new killing came amid mounting anger over the murder in Kabul on May 31 of popular 22-year-old television presenter Shakiba Sanga Amaj, who was also shot dead in her home.

Police have arrested a suspect for the killing of Amaj but the motive is still unclear. Some reports said her murder may have been related to her refusal to marry someone.