(Adds Lao comment) BANGKOK, May 16 (Reuters) - A 6.1 magnitude earthquake struck northern Laos on Wednesday, shaking buildings as far away as Bangkok some 800 km (500 miles) to the south, and Hanoi to the east. Shoppers fled some of the Thai capital's many malls in panic and some high-rise office blocks were evacuated after they swayed. People in Hanoi, the Vietnamese capital, also felt the tremor and office workers were ordered to leave some tall buildings. "The building shook quite a bit and we were told to evacuate," said Michael DiGregorio, a programme officer at the Ford Foundation, a U.S. philanthropic organisation with offices on the 15th floor of a Hanoi building. The United States Geological Survey (USGS) said on its Web site (http://earthquake.usgs.gov) the quake hit at 0856 GMT with its epicentre 92 miles (148 km) from the ancient Lao capital of Luang Prabang. People in Luang Prabang, a world heritage site on account of its centuries-old Buddhist pagodas and temples, said they felt only minor shaking. Longitude and latitude coordinates given by the USGS placed the epicentre in the sparsely populated, mountainous northern province of Luang Namtha, in the heart of the "Golden Triangle" opium-producing region near the Myanmar and Chinese borders. The tremors caused some panic in the neighbouring province of Oudomxai, but no damage or casualties, Lao Foreign Ministry spokesman Yong Chanhthalansy said. He had no word from Luang Namtha, a remote province mainly populated by hill tribes living in wooden or bamboo huts. "A deputy governor of Oudomxai told me over the phone he and his staff were having a meeting on the fourth floor of a building and they all ran down in panic," he told Reuters from Vientiane, capital of the landlocked country of 5.5 million people. Google Earth measurements suggested the quake's centre was 45 km (28 miles) from the border of southwest China. A hotel receptionist in Jinghong, in the Chinese border province of Yunnan, said windows shook for about a minute. "I was scared, but there was no damage and everybody seems fine," he told Reuters.
