YANGON, Burma—At least four people were shot dead during protests in Burma on Sunday, as security forces continued their violent crackdown against dissent following last month’s military coup. Two of the victims were killed in Yangon, the country’s largest city. One of them was shot in the head and another was shot in the abdomen, according to local media covering the demonstrations in Hlaing Thar Yar Township. A third person died in the northern city of Hpakant when police fired into a crowd of demonstrators, local media reported. A fourth victim, a woman, died after being shot in the head in Mandalay, the country’s second-largest city, as security forces were conducting clearance operations. In Yangon, video posted on social media showed crowds of people, some wearing hard hats and gas masks, running down a street amid sounds of gunfire. The demonstrators quickly sprayed vapor from fire extinguishers as they retreated. …