Thirty-seven tourists were killed when their coach was buried in a landslide after a massive earthquake in southwest China while separately officials said they had lost contact with 15 British tourists, state media reported Tuesday. The coach was buried by a landslide in Maoxian county in Tibetan populated Aba prefecture in Sichuan province, Xinhua news agency said, quoting a spokesman with the provincial emergency management office. Separately, the spokesman said about 15 Britons were among 2,000 tourists stranded in Aba prefecture and out of contact, it said.