Thieves made off with more than a dozen pieces of art, including works by Henri Matisse, from a library in São Paulo on Sunday.

Two men entered the Mário de Andrade Library during visiting hours and overpowered a security guard and an elderly couple before fleeing toward the nearby Anhangabaú metro station, according to CNN affiliate CNN Brasil, citing information from the country’s military police.

One of the suspects was arrested Monday, CNN Brasil reported , citing the man’s attorney, and police are on the hunt for the second suspect.

Since October, the library and the Museum of Modern Art of São Paulo have collaborated on an exhibition called “From book to museum,” featuring works by artists, including Matisse, Brazilian painter Candido Portinari and French artist Fernand Léger.

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