The Ontario Fire Marshal’s office says two consecutive fires that ravaged a Toronto high school in May have been ruled an accident.

Spokeswoman Carol Gravelle says the blazes at York Memorial Collegiate Institute weren’t intentionally set.

Toronto fire crews were called to put out a blaze in the auditorium area of the school in May.

After that was put out, firefighters were called back to the scene a few hours later for a second, six-alarm blaze.

Toronto Fire Chief Matthew Pegg tweeted that he received the report Thursday and will be “reviewing the report in detail.”

“Our team will review this fire investigation report in detail in order to gain a full understanding as to the origin, cause and circumstance analysis that has been completed and determinations that have been reached by the Ontario Office of the Fire Marshal,” he tweeted.

York Memorial was built in 1929 as a tribute to the youth killed in the First World War, and was designated as a heritage building in the 1980s.