Opposition President of Cambodia National Rescue Party Kem Sokha, right, greets his party supporters during a Buddhist ceremony to mark the 20th anniversary of the attack that killed 16 anti-government protesters in March 30, 1997, in Phnom Penh, Cambodia, Thursday, March 30, 2017. Buddhist monks and members of Cambodia National Rescue Party on Thursday chanted prayers at the memorial for the victims. (AP/RSS Photo/Heng Sinith)