Burma (also known as Myanmar) security forces opened fire on protests against the military rule on Wednesday, killing at least 18 people, a human rights group said, a day after neighboring countries called for restraint and offered to help Burma resolve the crisis. The security forces resorted to live fire with little warning in several towns and cities, witnesses said, as the junta appeared more determined than ever to stamp out protests against the Feb. 1 coup that ousted the elected government of Aung San Suu Kyi. “It’s horrific, it’s a massacre. No words can describe the situation and our feelings,” youth activist Thinzar Shunlei Yi told Reuters via a messaging app. A spokesman for the ruling military council did not answer telephone calls seeking comment. Ko Bo Kyi, joint secretary of the Assistance Association for Political Prisoners rights group, said in a post on Twitter: “As of now, so-called …