The Israeli military says Palestinian militants are firing rockets from the Gaza Strip.

The army said Saturday that sirens warning of incoming projectiles sounded several times in southern Israel.

In response, Israeli aircraft targeted two launch sites in northern Gaza. Local media reported three Palestinian casualties.

The deadly flare-up between Israel and Gaza militants enters a second day, shattering a monthlong Egyptian-mediated easing of hostilities.

On Friday, Israel said two soldiers were wounded by gunshots from the Hamas-controlled territory. No group claimed responsibility for the shooting.

Israeli aircraft carried out retaliatory strikes, killing two Hamas militants. Two other Palestinians were killed during the weekly protests along the Israel-Gaza perimeter fence.

Egypt has been trying to reach a long-term cease-fire between Hamas and Israel, who fought three wars the past decade.