GAZA CITY, Gaza Strip — Palestinian militants on Saturday fired over 200 rockets into Israel, drawing dozens of retaliatory airstrikes on targets across the Gaza Strip in a round of intense fighting that broke a monthlong lull between the bitter enemies. Four Palestinians, including a pregnant mother and her baby daughter, were killed, while three Israelis, including an 80-year-old woman, were wounded by rocket fire.

The fighting came as leaders from Hamas, the militant group that rules Gaza, and the smaller armed faction Islamic Jihad, were in Cairo for talks with Egyptian mediators aimed at preventing a fraying cease-fire from collapsing altogether.