The drones were hard to avoid: They buzzed low over the crowd of protesters holding banners and shouting slogans outside the NagaWorld casino in Phnom Penh, then hovered above each of the speakers as the crowd called for justice.
As hundreds of workers went on strike outside the glass and chrome towers of the firm's hotel and casino complex, demanding the reinstatement of nearly 400 employees who were laid off last year, armed riot police and surveillance cameras kept watch.
"We knew we were being recorded, but we couldn't do anything, so we would wave at the drones," said Chhim Sithar, 34, a union leader who was arrested at the January protest along with more than a dozen others and held in jail for nine weeks.