Three children have been reported injured in eastern Gaza City after Israeli aircraft carried out a series of missile strikes across the Palestinian territory.
Palestinian hospital officials said the children were injured by flying debris in the air raids that came in the early hours of Friday.
Al Jazeera's Casey Kauffman, reporting from Gaza, said there were attacks in at least six locations and work on tunnels which are often used for smuggling purposes into the blockaded territory, had stopped for fear of the strikes.
The Hamas government in Gaza had also ordered police stations across the strip to be evacuated, he added.
Israeli warning
Late on Thursday, the military said a Palestinian rocket fired from Gaza had landed in an open area of southern Israel.
Al Jazeera's Jacky Rowland, reporting from Jerusalem, said the rocket attack came despite a warning earlier in the day by the Israeli military that it would "respond harshly against any attempt to disrupt the calm in Israel's southern communities" in a report stating that nearly 20 rockets and mortars had been fired into Israel in March, most of them in the past three weeks.
There was no claim of responsibility for Thursday's lone rocket, which caused no casualties, but the Israeli army had said in its earlier statement that it held Hamas, "solely responsible for maintaining peace and quiet in and around" the territory.
Fawzi Barhoum, a Hamas spokesman, told Al Jazeera that Hamas held the Israeli government led by Binyamin Netanyahu responsible for the "escalation" but said the air raids had been expected because of threats by Ehud Barak, the defense minister, and other ministers.
He also blamed "the international community and the Arabs" for failing "to do anything about the situation in Gaza".
"The absence of the international community and the Arabs has allowed the Israelis to escalate the situation," he said.
The Israeli military hit targets from Gaza's north to south in Friday's raids.
In the south, an open area at a former Jewish settlement in Khan Younis and an open field at Rafah, near the Egyptian border, were hit.
In the central Gaza Strip, a metal workshop and an open area reportedly used often by Palestinian armed groups for training were targeted.
And in the north, missiles hit an area on the outskirts of Gaza City and a storage warehouse inside the city, where the three children were injured.
PHOTO CAPTION
Palestinian inspect the site of a destroyed factory after an Israeli airstrike in Gaza City
Al-Jazeera