Moscow ? Drawings by a famous architect worth millions of dollars have been stolen from a state archive, officials said Tuesday, raising fresh concerns about the security of Russia’s museum collections after a major theft at the famed State Hermitage.

Drawings by the late architect Yakov Chernikhov, widely admired for his avant-garde and constructivist designs, disappeared from the Russian State Archive of Literature and Art, according to Russia’s cultural heritage body, Rosokhrankultura.

The agency said it did not know exactly how many drawings had been stolen but that 274 of them – worth an estimated $1.3 million – had been recovered on the Russian antiques market and abroad.

The announcement came just more than a week after Russia’s State Hermitage museum revealed that more than 220 artworks worth about $5 million had been stolen.

Three suspects were detained in connection with the crime, including the son and husband of a late Hermitage curator who had been in charge of the collection when the theft occurred.

The Hermitage, started by Catherine the Great in 1764, has vast holdings of antiquities, decorative art and Western art that include world-renowned collections of Italian Renaissance paintings and 17th- and 18th-century Dutch and Flemish paintings as well as impressionist works.