Israeli warplanes struck dozens of targets in the Gaza Strip and three people were reported killed there, while Palestinian militants from the territory fired scores of rockets into Israel in a fierce burst of violence overnight and into Thursday morning.

The flare-up comes as Egypt is trying to broker a long-term cease-fire between the two sides. At least three Palestinians died — a pregnant woman, her 1-year-old daughter and a Hamas militant, according to the Gaza Health Ministry.

On the Israeli side, at least seven people were wounded.

It was not clear if the escalation, the latest in a series of intense exchanges of fire in recent months, would derail the indirect negotiations between Israel and Gaza’s Hamas militant rulers.

Air raid sirens signaling incoming rocket fire continued in southern Israel on Thursday morning, raising the likelihood of further Israeli reprisals.

Israel and Hamas have fought three wars since the Islamic militant group seized control of Gaza in 2007. Despite the animosity, the bitter enemies appear to be working through Egyptian mediators to avoid another war.

Hamas is demanding the lifting of an Israeli-Egyptian border blockade that has devastated Gaza’s economy, while Israel wants an end to rocket fire, as well as recent border protests and launches of incendiary balloons, and the return of the remains of two dead soldiers and two live Israelis believed to be held by Hamas.

But the continued outbursts of fire have jeopardized those cease-fire efforts. On Tuesday, the Israeli military struck a Hamas military post in Gaza after it said militants fired on Israeli troops on the border. Hamas said two of its fighters were killed after taking part in a gunfire parade inside a militant camp.

The incident occurred while a group of senior Hamas leaders from abroad were visiting Gaza to discuss the ceases-fire efforts with local leaders.

A top Hamas official told The Associated Press that the group waited for the delegation to leave Gaza before responding with rocket fire late Wednesday.

The Israeli military said over 150 rockets and mortars were fired at Israel, and Israel carried out over 140 airstrikes targeting Hamas militant positions.

Gaza’s Health Ministry identified those killed in the airstrikes from Wednesday to Thursday as Hamas fighter Ali Ghandour, 23-year-old Enas Khamash and her daughter Bayan. The ministry said the militant and the civilians were killed in separate incidents.