PITTSBURGH — Hundreds and possibly thousands of rare comic books were damaged at a comic museum’s warehouse last week.

Water leaks in the roof at the ToonSeum warehouse destroyed books, exhibition reproductions and probably thousands of comic books.

Executive director Joe Wos said the most valuable comics weren’t at the warehouse, but some of what was lost will be “very difficult to replace.” He said much of the material was waiting for transfer to the ToonSeum’s new on-site library.

The ToonSeum is one of only three museums in the country dedicated exclusively to the cartoon arts.