Sanders has emerged as the national front-runner after victories in the first three nominating contests, but his rivals contend that the self-declared democratic socialist would lose to Republican President Donald Trump in November's national election.
Members of Karenni group were protesting statue of Burmese independence hero General Aung San, father of leader Aung San Suu Kyi
Nobel Peace laureate says her nation welcomes "international scrutiny" over plight of Rohingya Muslims.
Kem Sokha faces up to 30 years in jail if convicted; arrest part of escalating government crackdown on dissent as crucial 2018 elections near.