Rioters have broken into a museum in Cairo, the capital city of Egypt, and smashed the heads off two mummies on display.
They also destroyed other exhibits and raided the gift-shop.
Local people were quick to help protect the Egyptian Museum by forming crowds outside every entrance to stop any more thieves breaking in.
The men have been caught and the stolen items returned according to police reports.
It happened during the massive anti-government protests going on around the country.
Newsround spoke to Omar El-Husseiny, who's a student at Cairo University.
He said: "Me and my friends all held hands in front of one of the gates of the Egyptian Museum to protect it from being destroyed by intruders. There were around a thousand of us. We stayed there until the army forces came. It is secure right now."
Protesters are angry with how the President, Hosni Mubarak, is running their country.
At least 100 people have died and up to 2,000 have been arrested since the demonstrations began a week ago.