An Israeli strike on a school sheltering displaced people in the Gaza Strip killed at least 21 people on Thursday, with the toll likely to rise, Palestinian medical officials said. Israel has continued to strike at what it says are militant targets across the Palestinian enclave even as attention has shifted to its war against Hezbollah in Lebanon and rising tensions with Iran.

Hezbollah launched a barrage of rockets into northern Israel on Tuesday as the group's Deputy Secretary-General Naim Kassem issued a defiant address vowing to defeat Israel's operations in Lebanon. More Israelis in the north of the country will be displaced as Hezbollah expands its operations, he said.