Updated

The U.N.'s top human rights official says she is alarmed that Israel's air campaign in Gaza may violate international laws prohibiting the targeting of civilians.

Navi Pillay says the Israeli military, which claims to have hit more than 1,100 targets that it says are mostly rocket-launching sites, and the Gaza militants, who have fired more than 550 rockets against Israel, must abide by international law.

Pillay said in a statement Friday she has "serious doubt about whether the Israeli strikes have been in accordance with international humanitarian law and international human rights law."

She says "civilians are bearing the brunt of the conflict" between Israel, Hamas and Palestinian armed groups in Gaza and called on all sides to refrain from launching attacks or putting military weapons in densely populated areas.