The Red Cross told CBS News on Wednesday that its staff in Gaza "were not able to intervene directly on-site" as alleged Hamas members were seen burying and then uncovering the remains of a deceased hostage in the Palestinian territory earlier this week.
The Israel Defense Forces released a video on Tuesday which it said showed the incident.
The Red Cross said it was "raising its concerns directly with parties."
The video, which appears to have been filmed by an IDF drone, shows masked men, some in military fatigues and others in civilian clothing, removing a shrouded body from a building near Gaza City's Shejaiya neighborhood and carrying it into a large adjacent pit, before burying it under rocks and dirt by hand.
A bulldozer is then shown lifting the body and a quantity of dirt and moving it to the front of the building, where it stayed as three people wearing red ICRC vests arrived.
The three people wearing ICRC vests remained at the site as the men moved the body from the bulldozer, placed it onto a large mound of dirt and buried it a second time.
Several minutes later, the video, which had been edited, shows a man with a shovel partially uncovering the body again while three people wearing red ICRC vests look on.
A man identified by the IDF as a photographer appears to film the second unearthing of the body, while the three apparent ICRC representatives stand near a road a short distance away from the site.
CBS News has verified the video's location in Gaza City, but was unable to independently verify the date or time the video was filmed or the identities of the masked men in the video. The video released by the IDF also includes several edits, where video clips were joined together.
The IDF accused Hamas of "attempting to create a false impression of efforts to locate the bodies, while in fact holding deceased hostages whose remains it refuses to release as required by the agreement."
