Authorities questioned a 15-year-old boy who reportedly confessed to joining a team that killed Pakistan opposition leader Benazir Bhutto, while helicopter gunships attacked suspected militant positions close to the Afghan border, officials and witnesses said Sunday, according to AP. A villager said two civilians were killed in the attacks Sunday in the South Waziristan region, where a spike in fighting in recent days has killed about 100 people, most of them militants. But military spokesman Maj. Gen. Athar Abbas said there were no reports of casualties. The arrest of the teenager in the town of Dera Ismail Khan in Pakistan's North West Frontier province could be the first break in the investigation into Bhutto's killing on Dec. 27 in a gun and suicide bomb attack. A senior intelligence official said the boy was arrested Thursday along with another militant suspect. He told investigators that his five-person squad was dispatched to Rawalpindi _ where Bhutto was killed _ by Baitullah Mehsud, a militant leader with strong ties to al-Qaida and an alliance with the Taliban in nearby Afghanistan. The official asked not to be named because he was not authorized to speak to the media. Authorities have already accused Mehsud, who is believed to be hiding in South Waziristan, of organizing the killing. Interior Secretary Kamal Shah also said the boy had confessed to involvement in the slaying. Both of the detainees were being questioned in an attempt to corroborate the confession, he said.