LAHORE- Unknown accused tortured to death a retired Major of Pakistan Army over petty issue today.Police said that Major Muhammad Ashraf (Retd.) hailing from Okara district was on a visit to Lahore along with his family to meet the relatives. In Defence near boulevard area of Lahore he exchanged hot words with some unknown motorists over blocking the road. The verbal clash turned violent after unidentified culprits tortured him brutally which resulted in death of Muhammad Ashraf. The accused sped away after the incident. The police have registered a case against unknown accused and started search for them.