Israeli forces shot dead four Palestinians, including a 14-year-old boy, and wounded dozens more in a major raid into a Gaza refugee camp just days after the first suicide bombing in Israel in nearly six months.
The incursion triggered the worst violence in Gaza in weeks.
Israeli helicopters fired warning shots and soldiers shot at Palestinians firing anti-tank rockets and hurling petrol bombs.
The clashes erupted after troops unearthed a tunnel near a Jewish settlement, according to a military source.
In a separate raid overnight in the nearby Khan Younis refugee camp, soldiers blew up two apartment blocks which Israel said Palestinian militants were using to attack soldiers and Jewish settlers.
Six Palestinians and two Israeli soldiers were wounded in the raid.
The operation followed Israeli threats to step up strikes on militants after 16 people were killed in a twin suicide bomb attack on two buses in the city of Beersheba on Tuesday.
