The release of Israeli hostages is set to be delayed.
Fifty hostages are set to be freed by Hamas during a four-day ceasefire under a new deal with Israel.
However, according to Israeli officials, the deal will now not happen before Friday.
It comes as Israel said its forces carried out aerial strikes on over 300 Hamas targets over the past 24 hours.
The release of hostages is set to be delayed
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Israeli National Security Adviser Tzachi Hanegbi said: “Negotiations for the release of our captives are progressing and continue all the time.
“The start of the release will proceed according to the original agreement between the parties, and not before Friday."
At least 50 women and children captured by militants are expected to be gradually released over a four-day period.
It is in exchange for a halt in fighting and the release of 150 Palestinian women and children jailed in Israel.
White House officials said final logistical details were being worked out
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White House spokesperson Adrienne Watson said final logistical details for the release were being worked out.
Adrienne Watson said: "That is on track and we are hopeful that implementation will begin on Friday morning."
Palestinian media said Israeli aircraft and artillery struck Gaza's southern city of Khan Younis in at least two waves and 15 people were killed.
Attacks were also reported in several other parts of Gaza, including the Jabalia and Nuseirat camps.
Israeli media, citing anonymous officials, reported the pause in fighting with Hamas also would not start before Friday.
Israel's Ynet news website reported that Israel had not yet received the names of the hostages slated for release by Hamas.
Since the Hamas attack on southern Israel that surprised the government and shocked Israelis, five hostages have been recovered alive.
Israel says 1,200 people were killed, mostly civilians and about 240 hostages of different nationalities taken hostage by Islamist gunmen.
Protests have been taking place in Israel
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Since then Israel has subjected Hamas-ruled Gaza to a siege and relentless bombardment.
According to medical officials in the territory, more than 14,000 Gazans have been killed, around 40% of them children.
The truce agreement, the first in a nearly seven-week-long war, was reached after mediation by Qatar.
It has been seen by governments around the world as potentially easing the suffering of civilians in the Gaza Strip.
