A senior Hamas official said Friday there could be no new exchange talks with Israel until it frees dozens of prisoners it has rearrested since their release in a 2011 swap.

Ismail Haniya, a former Palestinian prime minister, said Israel had re-arrested at least 54 of the more than 1,000 prisoners freed in exchange for soldier Gilad Shalit, who was captured in a cross-border raid by Gaza militants in 2006.

Two Israelis are being held captive by Hamas in the Gaza Strip after having crossed into the Palestinian territory, Israeli officials said Thursday, raising fears of another hostage crisis.

In 2011, Israel released more than 1,000 Palestinian prisoners in exchange for soldier Gilad Shalit, who had been held by Hamas for five years, and critics said that would encourage further abductions.

Israeli Jews and Arabs launched a collective fast on Wednesday -- the anniversary of last year's Gaza war -- to back their demands for peace with the Palestinians.

Members of the "Women Wage Peace" group set up a protest tent outside Prime Minister Benjamin Netanyahu's official Jerusalem residence and plan to take it in turns to fast over the course of 50 days, the length of the 2014 confrontation.

Israel and Palestinians marked one year since last summer's war in Gaza on Wednesday, with a U.N. official calling for an end to the "inexcusable" blockade of the territory that has helped prevent rebuilding.

The ceasefire that ended the 50-day war has largely held, but few of the issues that led to the conflict have been resolved and tens of thousands of Gazans remain homeless in the besieged strip.

Two lions cubs were on Sunday taken from a Gaza Strip refugee camp to Jordan, their former owner said, after their maintenance became too great a financial burden.

"We're very sad. The two lions were like children to us," Saadi Jamal said of the five-month old male and female big cats named Max and Mona.

Hamas authorities on Sunday reopened the offices of the Gaza Strip's only mobile telephone company, five days after closing them on accusations of tax-dodging.

A statement from attorney general Ismail Jaber's office said that he had "ordered the reopening" of telecom provider Jawwal in Gaza City, but it did not give reasons.

In the ruins of what used to be his home, Gaza Strip resident Rabah Abu Shanab reflects on what used to be -- and what little hope remains.

"We were doing better a year ago," the 57-year-old said while sitting on a plastic chair in his living room, now just concrete slabs and twisted iron bars.

Children scramble down a narrow corridor between giant concrete walls as if it were a real-life maze -- but the stark addition to their Israeli nursery has nothing to do with playtime.

"The children, they reflect their parents," said Hagar Weiner, the 62-year-old head of the nursery and kindergarten where concrete blast walls are designed to protect the children from rocket and mortar fire.

Palestinian Islamist movement Hamas on Friday dismissed as "propaganda" an Israeli claim that it provided support related to this week's jihadist attacks against Egyptian soldiers in Sinai.

"The occupation's (Israel) statements about Hamas helping IS are stupid accusations... and propaganda that aims to incite against Hamas," spokesman Sami Abu Zuhri told AFP, referring to the Islamic State group, whose fighters carried out the attacks.

A senior Israeli officer said Thursday the militant Palestinian movement Hamas played a part in attacks by the Islamic State group on Egyptian soldiers in the Sinai Peninsula.

"In the latest attacks Hamas gave support with weapons and organization to groups supporting IS," Major General Yoav Mordechai said in an interview in Arabic with Al-Jazeera television.