JERUSALEM—Israeli medics said at least two people were killed and more than 150 injured after a bleacher collapsed at an uncompleted West Bank synagogue on Sunday, the eve of a major Jewish holiday. The bleacher was packed with Orthodox worshippers and collapsed during prayers at the beginning of Shavuot. A spokesman for Magen David Adom told Channel 13 that paramedics had treated over 157 people for injuries and pronounced two dead, a man in his 50s and a 12-year-old boy. Rescue workers were on the scene, treating the injured and taking people to the hospital. The Israeli military said in a statement that it dispatched medics and other search and rescue troops to assist at the scene. Army helicopters were airlifting the injured. The collapse comes weeks after 45 Orthodox Jews were killed in a stampede at a religious festival in northern Israel. Amateur footage showed the collapse Sunday during …