Estimates said between 200,000 and 300,000 Palestinians in Gaza gathered in Al-Khatib Square after Hamas protesters drove those calling for unity out of the Square of the Unknown Soldier.
Ma'an doesn't tell us who said there were so many people, but it does provide us with photos. Here's the photo that shows the most people:
Based on this and other photos at the site, it looks like an estimate of 10,000 would be an exaggeration.
Meanwhile, Reuters has noticed Hamas attacking the protesters.