Gaza police have seized a work by famed street artist Banksy from a man who bought it for $200 from a family that later said it was duped, both sides told AFP.

Bilal Khaled, accused of buying the work painted on a door belonging to the Darduna family without telling them its real value, said Friday "the police seized it yesterday under a court order."

Israeli inspectors at a crossing point into the Gaza Strip stopped an attempt to smuggle in hi-tech electronics destined for Palestinian militants, the government said Monday.

Security staff at the Kerem Shalom goods crossing into southern Gaza found the equipment, banned from Gaza under Israeli restrictions, concealed on an Israeli lorry with a permit to take in consumer electronics.

The Palestinian official tasked with the reconstruction of the Gaza Strip following a devastating 50-day war with Israel has resigned, following criticism of the pace of work.

Economy Minister Mohammed Mustafa, who is also deputy prime minister for the national unity government between Islamist Hamas and President Mahmoud Abbas' Fatah movement, did not give a reason for his resignation.

A work by world-renowned graffiti artist Banksy has been sold for less than $200 in war-ravaged Gaza, where a homeless family says they were "tricked" into parting with the valuable collector's item.

At the end of February, the artist, who chooses to remain anonymous, released an online video showing three works he painted on walls of homes in the Gaza Strip destroyed in Israeli air strikes.

Hamas on Friday denounced a European Union decision to keep the Palestinian Islamist group and de facto Gaza Strip ruler on its terrorism blacklist, despite a court ordering its removal.

"This decision completely contradicts the court's ruling," Hamas spokesman Fawzi Barhum told Agence France-Presse.

The Israeli army committed war crimes and crimes against humanity during last year's offensive in Gaza, a rights group said on Friday. 

The 50-day military offensive in July and August 2014 -- code-named "Operation Protective Edge" --  "was marked by serious breaches of ... international human rights law," said the International Federation of Human Rights (FIDH).

In a damning report released Thursday, Amnesty International said Palestinian rocket fire during the 2014 summer war in Gaza had killed more civilians inside the Gaza Strip than inside Israel.

Such deadly attacks on civilians were against international law and constituted "a war crime," it said.

The long-running conflict with Israel claimed the lives of more Palestinian civilians in 2014 than any year since 1967, the United Nations said Thursday, in a damning report on the humanitarian situation.

Meanwhile, rights group Amnesty International criticised the "flagrant disregard" by Palestinian armed groups for the lives of Israeli civilians, fingering the Hamas rulers of the Gaza Strip as a culprit.

Palestinian Prime Minister Rami Hamdallah urged rival factions to set aside their differences, even as protesters gave him a cool reception in war-battered Gaza on Wednesday.

It was only Hamdallah's second visit to the Gaza Strip since a unity government agreed on by rivals Fatah and Hamas took office last June.

An Israeli court on Tuesday jailed for 15-and-a-half years a Palestinian caught fighting in Gaza during last summer's 50-day war between Israel and Hamas.

A transcript of proceedings in the Beersheba district court, in southern Israel, said that Mohammed Abu Zaraj, born in 1991, was one of a squad of the Ezzedine al-Qassam Brigades, Hamas' military wing, lying in ambush for advancing Israeli troops on July 27.