From The Times of Israel:

Radar scans of the tomb of pharaoh Tutankhamun in the ancient necropolis of Luxor showed a “90 percent” chance of two hidden chambers, possibly containing organic material, Egypt’s antiquities minister said Thursday.
Experts had scanned the tomb to find what a British archaeologist believes could be the resting place of Queen Nefertiti, the legendary beauty and wife of Tutankhamun’s father, whose mummy has never been found.
Preliminary scans of Tutankhamun’s tomb reveal “two hidden rooms behind the burial chamber” of the boy king, Antiquities Minister Mamduh al-Damati told reporters.
“Yes, we have some empty space, but not totally empty, including some organic and metal material,” Damati said in English.
When asked how certain he was, he said there was a “90 percent” chance.
A study by renowned British archaeologist Nicholas Reeves has said that Nefertiti’s tomb could be in a secret chamber adjoining Tutankhamun’s tomb in the Valley of Kings in Luxor in southern Egypt.

The next radar test is scheduled for March 31. The full story has more details.