PHOENIX (AP) — Officials say about 6,000 books were damaged in a storm that ripped through the Burton Barr Central Library Saturday night in downtown Phoenix.

The weekend flood after a monsoon caused a fire sprinkler pipe on the roof to burst and spread water throughout the building's five stories.

According to the Phoenix Fire Capt. Reda Bigler, the sprinkler line carried about 60 gallons of water per minute, much like a fire hydrant.

Library spokeswoman Lee Franklin says 6,000 is a small fraction of Burton Barr's 500,000-book collection.

Franklin says most of the damaged books came from the library's reference section and were older materials such as almanacs, atlases and encyclopedias.

All 208 Burton Barr employees have been reassigned to different libraries

Officials don't have a timeline for reopening the library.