Egypt reopened its Rafah border crossing with Gaza for two days from Tuesday, Palestinian border officials said, for the first time since March.

Maher Abu Sabha, director of border crossings in the Gaza Strip, said traffic was permitted into Gaza only, to allow the return of Palestinians stranded in Egypt.

Dozens of workers sit with their eyes glued to computer screens and fingers clicking away on keyboards writing code and tapping in data for clients around the globe.

It could be a scene at any software firm, but these programmers are Palestinians based in the Gaza Strip, which has been under an Israeli blockade since 2006.

The general responsible for Israel's border with the Gaza Strip says that continued rule by the territory's Islamist militant group Hamas is necessary for its stability, a newspaper reported Tuesday.

"There is no substitute for Hamas as ruler in the strip. The alternative would be the Israeli military and chaos in governance," top-selling Yediot Aharonot quoted Major General Sami Turgeman as telling heads of southern Israel local authorities in the Gaza border area on Monday.

A military court in the Hamas-run Gaza Strip on Monday jailed a Palestinian convicted of "spying" for Israel to 15 years, judicial sources said.

In March two other men were given the same sentence for the same offense.

A Palestinian truck driver in the southern Gaza Strip was seriously wounded on Monday by gunfire from Egypt, medics said.

"A 27-year-old driver who was working at the Kerem Shalom crossing was seriously wounded on Monday morning by shots which were fired from the Egyptian side of the border," health ministry spokesman Ashraf al-Qudra said.

Israeli troops shot and seriously wounded a 17-year-old Palestinian in the northern Gaza Strip on Friday, medics said.

The youth, whose name was not immediately released, was hit in the head north of Beit Lahiya near the border with Israel, Gaza health ministry spokesman Ashraf al-Qudra said in a statement.

A jihadist group that recently emerged in the Gaza Strip claimed Friday a mortar attack on a base belonging to the Islamist Hamas movement in charge of the blockaded territory.

The group calling itself Supporters of the Islamic State in Jerusalem said it fired two 82 mm mortar rounds at a base of Hamas's armed wing, the Ezzedine al-Qassam Brigades, in Khan Yunis in southern Gaza.

The Egyptian military Wednesday shot dead three Palestinian gunmen who infiltrated through a smuggling tunnel in the Sinai town of Rafah on the border with Gaza, security officials said.

They said the "armed Palestinians" and the military clashed in a buffer zone established along the border.

A group of veteran Israeli combatants on Monday slammed the army's conduct during the 2014 Gaza war, using soldiers' testimonies to expose a policy it said caused "unprecedented" civilian casualties.

The testimonies appeared in a 237-page report called "This is how we fought in Gaza" which was based on the anonymous accounts of 60 soldiers and officers involved in the 50-day war last summer.

A bomb blast targeted Hamas's security headquarters in Gaza City on Monday, witnesses said, after radical Islamists issued a threatening message calling for the release of prisoners.

The explosion just before dawn damaged the building's perimeter wall, witnesses told AFP.