August 25 marks the seventh anniversary of the start of a campaign of mass atrocities by Myanmar's security forces in Rakhine State, which forced more than 700,000 Rohingya to seek refuge in Bangladesh. UN human rights chief Volker Türk on Friday expressed grave concern about the sharply deteriorating situation across Myanmar, particularly in Rakhine, where hundreds of civilians - mostly Rohingya - have reportedly been killed while trying to flee ongoing fighting.