'You're asking the accused ['Israel'] to investigate itself?'

"Go investigate yourself."

..is... is that supposed to be a western liberal tough talk or something? Performative parenting at its worst.

"We are continuing to press them for additional information."

"But why not why not have an independent forensic investigation, which the Palestinians are calling for?"

As Hunter Thompson said, to ask the question is to answer the question.

“Well, we have police departments investigate themselves…”

They cant seem to get off the "israel said so" train. Refusing to even consider an alternative. Is there no way to get a different member of the international community involved enough to run such an independent examination? Or is everyone else sitting on the fence watching to see how yhe play ends?

According to this article, IDF claims the dead were buried there by Palestinians, the mass grave was checked by IDF for hostages' remains, then re-buried, and IDF does not tend to Palestinian remains in Gaza:

The Israel Defense Forces on Tuesday rejected Hamas’s allegation as “baseless.”
It said forces searching for Israeli hostages had examined bodies previously buried by Palestinians near Nasser Hospital and had returned the bodies to where they were buried after they were examined.
It has been documented that Palestinians buried their dead at the hospital grounds both before and while Israeli troops operated in the area.
The location of that burial site was geo-located by experts to the same location where Hamas officials claimed to have discovered the new mass grave.
Generally, the IDF does not tend to the bodies of slain Palestinians in the Gaza Strip. ...
The United Nations rights office claimed that some of the bodies were “found with their hands tied and stripped of their clothes.”
The IDF, in its response, said that during its operation in the area of Nasser Hospital in recent months, troops examined corpses that had been buried by Palestinians on the medical center’s grounds, “as part of an effort to locate hostages.”
The military said it operated in a “targeted manner,” only where it had intelligence that Israeli hostages may have been buried.

Curious if there is anything to this or if it is just another false allegation.

Who is going to let another country investigate their Military during an ongoing war? Isreal has to be the one to provide the reports its not that unexpected or out of the ordinary.