A baby and her pregnant mother were among three Palestinians killed by Israeli strikes in Gaza on Wednesday, officials said, as the Jewish state struck targets in response to dozens of rockets fired at its territory.
Enas Khammash, 23, and her 18-month daughter Bayan were killed in an airstrike in Jafarawi in central Gaza, the health ministry in the Hamas-controlled strip said. Her husband was injured.
The ministry said Khammash was pregnant.
The Israeli army said it had struck about 100 "military targets" belonging to Hamas in the strip.
"The Israeli strike was conducted in response to the rockets launched from the Gaza Strip at Israeli territory over the course of the evening and night," it claimed.
It said the targets "included manufacturing facilities, training complexes and advanced weapons and capability sites" belonging to Hamas.
Smoke could be seen rising from Gaza City on Wednesday evening.
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A Hamas fighter was killed in one strike, with at least 12 others injured, the health ministry in Gaza said.
The strikes came after dozens of rockets were launched from the coastal enclave towards Israel.
The country's Iron Dome missile defence system intercepted 11 of the 70 launches, the army claimed, while most of the others landed in open areas.
At least two hit the Israeli town of Sderot, near Gaza's northern border, police and the army said.
One person was slightly wounded by shrapnel while several others were treated for shock in Sderot, the United Hatzalah medical service said.
A statement from the military wing of Hamas, the group that runs Gaza, claimed responsibility for the rockets.
It said the Palestinian "resistance" had fired a large number of rockets at "enemy positions in the Gaza envelope".
Sirens sounded in several Israeli areas close to the border with Gaza, warning residents to seek shelter, the Israeli army said.
"As of now, approximately 70 rocket launches were identified from the Gaza Strip at Israeli territory," the army said.
Israeli television broadcast images of a house and cars reportedly damaged by the rockets in Sderot.
The United Nations condemned the Hamas rocket fire.
"I am deeply alarmed by the recent escalation of violence between Gaza and Israel, and particularly by today's multiple rockets fired towards communities in southern Israel," UN envoy Nickolay Mladenov said.
He called on all sides to step "back from the brink".
The rocket fire came after two fighters from the military wing of Hamas were killed by Israeli fire on Tuesday.
Hamas warned Israel – with which it has fought three wars since 2008 – it would pay for the attack.
The escalation came after the Hamas leadership convened for a rare meeting in Gaza on Friday.
The gathering had raised hopes a deal for a lasting truce with Israel, with the backing of Egypt and the UN.
Clashes along the Gaza border since the end of March have seen at least 165 Palestinians killed by Israeli fire.
The majority were killed during violent protests, but others have died in airstrikes or tank fire.
One Israeli soldier was shot dead by a Palestinian sniper.
Israel and Hamas have fought three wars since 2008.
The last, in 2014, ended with a tense ceasefire and analysts say another round of conflict is likely.