The UN special envoy on Myanmar has warned of the potential for an escalation of violence in the country on Wednesday, as anti-coup protesters are expected to face off once again with the military. The warning comes after deposed civilian leader Aung San Suu Kyi was slapped with a second charge on Tuesday — and the UN rapporteur hinted she may have even secretly been put on trial. Myanmar was plunged into an internet blackout for the third night running, Britain-based monitoring group NetBlocks said, as the generals try to wear down the anti-coup uprising. In the two weeks since the military …