The Sebastopol Regional Library has closed “indefinitely” until further notice, library administrators said Thursday, citing possible environmental concerns.

According to Sonoma County Library spokesperson Petula Burks, the library and city of Sebastopol is currently assessing a “potential environmental hazard” at the Sebastopol branch.

City partners are currently running tests and investigating the situation, including possible concerns with mold and wallpaper peeling, according to a Sonoma County Library administrator.

The Sebastopol Regional Library closed at 4 p.m. Thursday and will remain closed for the weekend. After the assessment, Burks said additional updates will be made regarding the library’s status and reopening. However, it is currently closed “indefinitely” until the situation and potential mitigation efforts are identified.

All books on hold at the Sebastopol library have been relocated to the Forestville Community Library and have been extended until June 19. The Forestville library will also have extended hours to account for the closure.