A leading Afghan insurgent group has said it would agree to a ceasefire if US coalition forces stayed in their main bases. In an interview with the BBC, Habib-ur-Rahman, son of Hezb-e-Islami chief Gulbuddin Hekmatyar, said his father was willing to stop fighting adding that the group has already had talks with Afghanistan Government and the Americans.The Taliban this week rejected talks while Western forces remain.Gulbuddin Hekmatyar is regarded as one of the three main insurgent leaders, along with Mullah Omar, the Taliban chief and Sirajuddin Haqqani, leader of Haqqani Network. Hezb-e-Islami is viewed as the country's most important rebel group after the Taliban.