In the occupied Palestinian territories, the Gaza Strip is on alert after two bombs killed three Hamas police officers at checkpoints Tuesday night. The deaths were reported by the Interior Ministry. Palestinian officials blamed the attacks on Israel, but other sources say a group linked to the Islamic State may be responsible. Tuesday’s blasts followed an Israeli attack on a Hamas military post earlier in the day, and after separate air attacks Monday on what the Israeli military says was a Hamas compound. Israel launched the air raid in response to cross-border rocket fire, though Hamas denied any involvement.