Mere hours after warring Christian and Moslem forces said they would give an Arab League cease-fire plan a second chance, a Christian-held city was hit by a Moslem rocket attack that claimed two lives.

"A cease-fire agreement that went into effect at 2:30 p.m. has been reached after contacting both parties," Arab League Under Secretary Lakhdar Al Ibrahimi said Thursday after meeting with the leaders of Lebanon's rival governments.Soon after the announcement, artillery and rocket fire stopped across the divided capital and at the presidential palace in the Christian suburb of Baabda, southeast of Beirut, officials said.

But six hours later, Moslem militiamen fired about 40 rockets into the Christian-held port city of Jouneih, 12 miles north of Beirut, killing a woman and a 4-year-old child and wounding 11, all members of the same family.