One limestone sarcophagus sealed with plaster is thought to be more than 4,000 years old, according to the BBC.
The mummies ~ 22 of which were found in niches along a wall ~ were in a tomb dating to 640BC, Hawass said. One wooden sarcophagus had not been opened since ancient times, though one official said ancient grave robbers had probably reached it first, according to a government statement.
A mummy was found in the only sarcophagus to have been opened so far, and archaeologists said they were expecting to find more mummies in the others.
At right, a worker cleans the face of the recently discovered mummy.
Click here for the BBC article and a video.