BUCHAREST, Romania (AP) — The head of Interpol says he believes police will retrieve valuable paintings that were stolen from a museum in the Netherlands last year, including works by Picasso, Monet and Matisse.

Dutch detectives and a prosecutor are currently in Romania to investigate the possible involvement of three men— arrested Monday in Romania— in the Oct. 16 theft from Rotterdam’s Kunsthal gallery of seven extremely valuable paintings.

Interpol Secretary General Ronald K. Noble said Thursday he is confident the works will be recovered.

Romanian police and Noble declined to provide more information citing the sensitivity of the case.

“The people involved are probably watching ” this press conference, Noble said.