Hamas has said that it has no knowledge of any mortar attack on Israel and remains committed to the truce.
Israeli defence forces earlier said a mortar had been fired from Gaza.
The official Israel Defense Forces has claimed the country was hit by a mortar fired from Gaza earlier today:
Earlier today, a mortar shell fired from Gaza hit Israel. This is the first launch since the end of Operation Protective Edge.
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Muslim and Jewish leaders in the UK have issued an unprecedented joint statement, calling on both faiths to "export peace" to Gaza.
The Muslim Council of Britain and the Board of Deputies of British Jews made the joint call an open-ended truce was agreed in the Middle East.
Both Israel and Hamas have claimed victory following the recent conflict, which is thought to have claimed the lives of 2,143 Palestinians and 70 Israelis.
The MCB and the BoD said they condemned the civilian casualties and hoped for "lasting peace", while also stating Muslims and Jews should "get to know one another".
The death of every civilian is a tragedy, and every effort should be taken to minimise such losses. The targeting of civilians is completely unacceptable and against our religious traditions. We pray for a speedy end to the current conflict and for a lasting peace for all.
Al Qaida's Syrian branch Nusra Front and other Islamist fighters have taken control of a border crossing dividing Syria from the Israeli-occupied Golan Heights, a monitoring group has said.
The fighters, who have vowed to "liberate" the area, captured the Quneitra post on the Syrian side from forces loyal to President Bashar al-Assad following fierce clashes, the Syrian Observatory for Human Rights said.
Stray fire from Syria wounded an Israeli soldier in the occupied Golan Heights, the Israeli military has said, as fighting between rebels and the Syrian army approached the border area.
Israeli emergency services said the soldier was wounded by errant mortar shell and evacuated to a local hospital.
Earlier today, fire from Syria injured an IDF officer. In response, we struck 2 Syrian military positions in the Golan Heights.
Earlier today, an IDF officer was moderately injured as a result of errant fire from Syria. The officer was evacuated for medical treatment.
Local media reported shortly after the incident that Syrian rebels had taken hold of the Quneitra border crossing.
Egypt has called on Israel and the Palestinians to halt fire and resume ceasefire talks.
Violence continued unabated with Israeli air strikes in the Gaza Strip and Hamas militants firing rockets at the Jewish state.
A senior Egyptian diplomat said Palestinian president Mahmoud Abbas had informed Sisi that Hamas was prepared to come to Cairo for further talks, but Hamas has not immediately confirmed the report.
Gaza health officials said five people, including two children, were killed in an Israeli strike on a house in central Gaza.
Four more Palestinians were killed in other strikes.
The Israeli military said Gaza militants had fired more than 40 rockets at Israel and no Israeli casualties were reported.
This photo shows the aftermath of a mortar attack launched from the Gaza Strip which killed an Israeli child.
More than 80 rockets were fired from Gaza into Israel, wounding people at a synagogue in Ashdod and two others in Beersheba and Sderot, Israeli police said.
Israeli security sources have said that the four-year-old was killed in a collective farm close to the border with the Gaza Strip.
The boy would be the fourth civilian in Israel to be killed in an attack from the coastal territory since the outbreak of conflict on July 8, and the first Israeli death since an Egyptian-brokered truce broke down earlier this week.
A four-year-old Israeli child has died from a mortar bomb fired from Gaza, according to Israeli media sources.