Egypt is trying to halt an auction of a 3,000-year-old stone sculpture of the famed boy pharaoh Tutankhamun at Christie's in London.

The Foreign Ministry issued a statement late on Monday saying Egypt demands the auction house provide documents proving the artifact's ownership. It says Egypt has also reached out to British authorities and the U.N. culture and education agency to stop the sale.

Christie's didn't immediately respond to a request for comment.

The statue — a brown quartzite head depicting King Tut — is scheduled to be auctioned off in July and could generate more than $5 million.

King Tut ruled Egypt from 1332 to 1323 B.C. His tomb was discovered in 1922 by Howard Carter in Luxor.

Egypt is trying to bring home antiquities it considers state property.