Myanmar’s military has arrested a prominent travel executive and champion of responsible tourism, Myo Min Zaw, TTR weekly reported.

Reports suggest he was charged under section 505a that restricts freedom of speech and participation in democracy demonstrations. Details are sketchy as both Myo Min Zaw’s Facebook and Twitter accounts closed or were deactivated after he was arrested at his Yangon residence in the presence of his wife and son.

Tourism executives, mostly supporters of the Mekong region’s responsible tourism projects in Cambodia, Thailand, Laos and Vietnam, expressed their grave concern over the safety of travel industry executives and staff detained in Myanmar and called for their immediate release, according to the TTR report.