Jammu, Aug 7 (IANS) A suspicious vehicle on Friday jumped a security barricade and fled despite warning shots fired by the security forces, raising alarm on the strategic Jammu-Srinagar highway being used by Amarnath Yatra pilgrims.A four-wheeler vehicle evaded a police checkpoint at Chanderkote on the Jammu-Srinagar highway in Ramban while travelling from Srinagar to Jammu, prompting security forces to launch a search operation. Officials said police personnel signalled the vehicle to stop at a…