153 families hold sit-in outside Boeing in China . Relatives marched from their hotel after request to meet Malaysian ambassador failed . The small gathering departed after delivering a letter of protest to the embassy demanding an explanation for how the prime minister of Malaysia has concluded that the plane ended its flight over the Indian Ocean . More than once in march Malaysian authorities have not shown up for talks with relatives . NEW : Beijing appeals to protesters to express concerns in `` legal and rational way ''
153 families hold sit-in outside Boeing in China . Relatives marched from their hotel after request to meet Malaysian ambassador failed . More than once in march Malaysian authorities have not shown up for talks with relatives . NEW : Beijing appeals to protesters to express concerns in `` legal and rational way ''