No survivors from Laos plane crash-official HANOI, May 27 (Reuters) - A 40-seat Russian-built plane carrying senior military personnel from Vietnam crashed in Laos and all passengers were believed to have been killed, a Laos government official said on Wednesday. The official Vietnam News Agency (VNA) quoted a Laos Defence Ministry statement as saying a Russian-made Yak-40 carrying a delegation led by Lieutenant General Dao Trong Lich, chief of the General Staff of the Vietnam People's Army, had been missing since Monday. Details of the plane's route and take-off time given by VNA and the Laos official were the same, although VNA did not say if the plane had actually crashed. "All aboard the plane, mostly senior military delegates from Vietnam, are believed to be killed," the Laos official said by telephone from the Laotian capital Vientiane. It was unclear how many people were aboard the plane and the Laos official, who declined to be identified, did not have the names of the passengers. Lich, also one of several vice defence ministers in Vietnam, was leading a military delegation which left Vietnam for neighbouring Laos last Saturday. The Laos official said the plane left Vientiane on Monday for Xiang Khoang province in the country's north when it flew into a heavy rain storm and crashed in jungle about 300 km (188 miles) north of the capital. The wreckage was spotted late on Tuesday, added the official. "A rescue team from Laos flew out of Vientiane on Wednesday morning to retrieve the wreckage and bodies," he said. Laos, Cambodia Enhance Trade Cooperation HANOI (May 27) XINHUA - Laos and Cambodia have decided to enhance their trade cooperation. The local media reported that Laos and Cambodia reached an agreement in Vientiane on Monday. They announced a boost in their cooperation in accordance with the principle of the most-favored treatment in tariffs and fees levied on exports and imports. The agreement is additional to a previous agreement signed in May, 1994, which opened a path for the two countries to expand mutual trade and further strengthen economic cooperation on the basis of the laws of each country. The delegations of the two countries held a consultative meeting on May 23 to find ways to increase bilateral trade cooperation.