Looters entered the Egyptian Museum in Cairo and damaged ancient artifacts, as large scale anti-government demonstrations continued.
In the Egyptian capital, security forces and protesters clashed repeatedly on Friday night and into the early hours of Saturday morning.
In the confusion, commercial and residential buildings were looted and government buildings were set on fire.
At the world famous Cairo museum, looters smashed glass display cases and damaged two mummies, along with ancient artifacts and a wooden boat.
The museum is a major tourist attraction and well known for its vast collection of ancient Egyptian cultural assets, which include the gold Mask of King Tutankhamun.
Many Egyptians formed a human chain in front of the museum to prevent looting, but they could not stop the vandalism.