The Israeli government says it has allowed a member of Hamas into territory in Gaza controlled by the Israel Defense Forces (IDF) to help Red Cross and Egyptian personnel search for the bodies of 13 remaining dead hostages.

"The Red Cross, the Egyptian technical team, and a Hamas person have been permitted to enter beyond the IDF's Yellow Line position in Gaza under close IDF supervision," government spokeswoman Shosh Bedrosian told a briefing.

She also said the Egyptians would bring in more equipment, including "tractor-type vehicles".

Israel accuses Hamas of violating the two-week-old Gaza ceasefire deal because it has returned only 15 of the 28 hostages' bodies it was holding.

The Palestinian group says it is committed to the deal brokered by the US, Egypt, Qatar and Turkey, but that it needs help to find remains buried under the rubble left by two years of war.