Thai police have arrested three migrant Burmese workers after a British yacht skipper was allegedly murdered by having his throat slit and being thrown overboard, according to media reports. Thai police believe pirates slit 64-year-old Malcolm Robertson’s throat and tied up his wife Linda, 57, when they raided their yacht near Koh Dong, an island about 73km (45 miles) off southern Thailand’s Andaman sea coast, the British Press Association reported.