I'm sure some of the deaths are. Here's a quote from a survivor of the music festival:
"Finally, IDF soldiers approached us, but they thought we were terrorists and began shooting. We yelled that we were Israelis and they stopped. In the end, an army helicopter came to take away the wounded," Adi said.
https://nationalpost.com/news/surviv...music-festival
We already know the IDF killed hostages so it wouldn't be surprising that they've killed more Israelis.