At least 28 people were killed in an Israeli strike on a former school building in the Gaza Strip on Thursday, Palestinian medical officials said. The attack on the central city of Deir al-Balah also left dozens of people injured, the Hamas-controlled Health Ministry in the sealed-off coastal territory said. The building was being used to accommodate Gazans who have been internally displaced by the year-old war between Israel and Hamas militants. Israel’s military said it attacked a Hamas command centre that was located in the building and that measures were taken to reduce the risk to civilia…