Two Chinese telecoms engineers have gone missing in frontier province along with their driver and a security guard, an embassy official and police said Sunday. The group disappeared on Friday in restive North West Frontier Province near the border with Afghanistan, a senior diplomat at the Chinese embassy told Agencies. Police have sent three investigation teams to the rugged area in an attempt to trace the engineers and their entourage. "We don't know whether someone has kidnapped them, they have lost their way or met an accident, because it is a mountainous area," senior police official Khurshid Khan said.