The police said that the man wrote several messages in Arabic on the walls of the museum.
French police said that the man broke into the museum early on Wednesday morning, October 23.
The police are searching for a possible accomplice. The man who broke into the museum and locked himself inside , was not armed, police confirmed.
Police, however, said that the unidentified man shouted threats and allegedly wrote threatening messages.
One of the messages written in Arabic allegedly reads “the museum is going to become a hell.”
Several security units were called to the scene including France’s RAID unit and a bomb disposal unit.
Police said that the man’s motivation is unclear.