KARACHI: Two Pakistani doctor brothers, cleared of convictions for providing medical treatment and money to al Qaeda-linked militants, have been freed after nearly two years in custody, an official said Saturday. The brothers, Akmal and Arshad Waheed, had been arrested in Karachi in June 2004 on suspicion of sheltering, helping and treating Pakistani and foreign militants. They were convicted in 2005 and sentenced to seven years in prison. But last week, a Karachi court quashed their convictions and asked authorities to immediately free them. But, instead of implementing the court order, police re-arrested them under a law that allows the government to hold any terror suspects for three months. Rashid Alam, the official in charge of police and civil security agencies in Sindh province, of which Karachi is the capital, said the brothers had been released, and reached home on Friday.