Israel pulled out of talks Tuesday and resumed its airstrikes in Gaza, accusing Hamas of violating terms of a temporary cease-fire by launching rockets aimed at the southern city of Beersheba.
Israel Defense Forces reported at least 50 rockets originating from Gaza were fired late Tuesday, setting off air raid sirens in southern Israel and as far away as Tel Aviv and Israel. There were no reports of injuries.
Israel's civil defense authority, the Home Front Command, ordered authorities to reopen public bomb shelters within 50 miles of Gaza.
"The IDF remains alert and maintains both defensive and striking capabilities in order to address the renewed aggression," Israel Defense Forces said in a statement. "The IDF is determined to defend the civilians of the state of Israel."
Hamas spokesman Sami Abu Zuhri told AFP the claim by Israel was a ruse to sabotage talks in Cairo aimed at a longer-term cease-fire.
"We don't have any information about firing rockets from Gaza," he said. "The Israeli raids are intended to abort the negotiations in Cairo."
However, shortly before the launch, Hamas spokesman Fawzi Barhoum said: "If (Israel Prime Minister Benjamin) Netanyahu doesn't understand … the language of politics in Cairo, we know how to make him understand."
Israeli government spokesman Mark Regev put the blame on Hamas, the militant group that controls Gaza. "When Hamas broke the cease-fire and fired rockets into Israel, they also violated the premise of the talks, which were based on an unconditional and total cease-fire," he said.
It is not immediately clear if the renewed hostilities will lead to a longer-term resumption in attacks by both sides, effectively ending a fragile cease-fire that has been in place for several days.
Nearly 2,000 Palestinians have been killed since the fighting broke out July 8. Gaza's Health Ministry and the United Nations say the majority of them were civilians. Israel says it has lost 67 people, including three civilians.
On Tuesday, three people — two women and a 2-year-old girl — were killed in an airstrike on a house in Gaza City, Palestinian medical official Ashraf al-Kidra said.
The indirect peace talks taking place in Egypt had yielded few signs of progress. Hamas is seeking an end to a seven-year Israeli-Egypt blockade that has ravaged Gaza's economy, while Israel wants guarantees that Hamas will disarm.
An Egyptian compromise proposal calls for easing the blockade, but not lifting it altogether and opening the territory's air and seaports as Hamas has demanded.
In Washington, the Obama administration placed a Gaza-based extremist group on several terrorism blacklists, freezing any assets it may have in U.S. jurisdictions and barring Americans from transactions with it.
The group, Mujahidin Shura Council in the Environs of Jerusalem, was designated a "foreign terrorist organization" as well as a "specially designated global terrorist" entity.
The council is an umbrella organization for a number of groups that have claimed responsibility for multiple rocket attacks on Israel since 2012, according to the U.S. State Department. It has also declared its support for the Islamic State group in Iraq and Syria, the department said.
Contributing: The Associated Press