Dozens of people have been killed or injured in a blast at a refugee camp in the Rafah area, the Hamas-run health ministry in Gaza has said.Videos from the scene in the southern Gaza Strip showed a large explosion and intense fires burning.The Israel Defense Forces (IDF) said it had targeted two senior Hamas leaders at one of the group's compounds and would review reports fire had spread to shelters, harming civilians.Hours earlier, Hamas had fired eight rockets from Rafah towards Tel Aviv, the first long-range attacks on the city since January.The strike on Rafah came two days after the International Court of Justice ordered Israel to immediately halt its military operation in Rafah, where hundreds of thousands of civilians are still sheltering.In a statement released after the blast inside Gaza on Sunday night, the IDF said it had eliminated two senior Hamas figures - Yassin Rabia and Khaled Nagar - in a precise air strike in north-west Rafah.The IDF said it had targeted Hamas militants with precision weapons.Hamas-run authorities said 35 people had been killed and dozens injured at a camp for displaced Palestinians north-west of Rafah, away from recent military operations in a designated humanitarian safe zone.It said women and children are among the dead.