The arrest of tomb robbers led archaeologists to the graves of three royal dentists, protected by a curse and hidden in the desert sands for thousands of years in the shadow of Egypt's most ancient pyramid, officials announced Sunday.

The thieves launched their own dig one summer night two months ago but were apprehended, Zahi Hawass, chief of Egypt's Supreme Council of Antiquities, told reporters.

That led archaeologists to the three tombs, one of which included an inscription warning that anyone who violated the sanctity of the grave would be eaten by a crocodile and a snake, Hawass said.