Dozens of people have been killed in a stampede at a religious festival in the north-east of Israel. At least 45 people died and 150 were injured at the all-night festival, which attracted tens of thousands of Orthodox Jews. It is unclear what triggered the crush but police sources believe it started after some attendees slipped on steps, causing dozens more to fall. Israel’s Prime Minister Benjamin Netanyahu has promised an investigation into the incident. During a visit to the scene near Mount Meron on Friday, Mr. Netanyahu said the investigation would ensure this kind of disaster never happens again. He told reporters that children were among those crushed to death. He said the disaster was one of the worst in Israel’s history and Sunday would be a day of national mourning.