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.

Kamal Khamash, brother-in-law of the killed woman, said the family was asleep when the projectile hit the house.

The mother and daughter died immediately and the father is in critical condition, Kamal said.

“This is a blatant crime and Israel is responsible for it,” he said.

Israeli army spokesman Lt. Col. Jonathan Conricus insisted Israel only targeted Hamas military targets in Gaza.

In southern Israel, two Thai laborers were among the seven wounded by rocket fire, and rockets damaged buildings in the cities of Sderot and Ashkelon. The military said it intercepted some 25 rockets, while most of the others landed in open areas. Israel said it launched airstrikes targeting rocket launchers, weapons stockpiles, tunnels and other Hamas infrastructure.

Israeli Cabinet minister for construction and housing, Yoav Gallant, said that “whatever is needed to be done to defend our civilians and soldiers, will be done, no matter what would be the price in Gaza.”

Conricus wouldn’t comment on Israeli media reports of troops preparing for a possible ground operation, but said Israel “had ground troops that are ready to deploy. We are reinforcing the southern command and Gaza division.”

Nickolay Mladenov, the U.N. special envoy who is involved in Egyptian efforts to broker a truce, said in a statement on Thursday that he’s “deeply alarmed” by “multiple rockets fired toward communities in southern Israel” the day before.

Mladenov warned that “if the current escalation however is not contained immediately, the situation can rapidly deteriorate with devastating consequences for all people.”

On Wednesday, the Israeli military shelled the Palestinian territory after civilians working on the Gaza border fence came under fire. Hamas militants responded with a cross-border fusillade that sent Israelis scrambling for air raid shelters.

The Hamas official, speaking on condition of anonymity because he was discussing classified negotiations, said that cease-fire talks were in their final stage but that disagreements remained. He said Hamas is demanding the complete lifting of the Israeli-Egyptian blockade, while Israel has offered only to ease the restrictions.

Tension along the Israel-Gaza border has escalated since late March, when Hamas launched what would become regular mass protests along Israel’s perimeter fence with Gaza. The protests have been aimed in part at trying to break the blockade.

Over the past four months, 163 Palestinians have been killed by Israeli fire, including at least 120 protesters, according to the Gaza Health Ministry and a local rights group. An Israeli soldier was killed by a Gaza sniper during this period.

Israel says it has been defending its sovereign border against infiltration attempts by Hamas. But it has come under heavy international criticism for its frequent use of force against unarmed protesters.

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Associated Press writers Mohammad Daraghmeh in Ramallah, West Bank, and Fares Akram contributed to this report.