IMPHAL, May 27 ? At least 10 Assam Rifles jawans were killed and five others seriously injured in an ambush by suspected Manipur insurgents at Gangsad area, about 40 km north-east of here today, official sources said, reports PTI. The armed insurgents attacked the Assam Rifles convoy belonging to 25th battalion while the security personnel were returning to Imphal, the sources said. Reinforcements were rushed to the spot and a combing operation launched. The insurgents, however, escaped through the jungles and hills, the sources said.