A cease-fire largely held on Sunday along a tense Gaza-Israel border on Sunday following a day of fierce fighting, but Israel remained on high alert and boosted its air defenses in case hostilities resume.

Israel carried out dozens of airstrikes in Gaza on Saturday, killing two teenage boys, and militants fired more than 100 rockets across the border, wounding three people in a southern Israeli town.

The cease-fire, the second between Israel and Gaza's dominant Hamas Islamists to be brokered by Egypt this year after a previous day-long flare-up in May, came into force late on Saturday.