Firefighters in Peru say fire swept through a substance abuse rehabilitation center near the capital, Lima, killing at least 14 people Saturday.

Local Peruvian media report that a patient set a mattress on fire at the Sacred Heart of Jesus Clinic in Chosica.  The report has not been confirmed.

Authorities investigating the cause of the blaze say some doors were locked, not allowing people to get out.

The facility treats and provides housing for people with drug and alcohol addictions.

The fire is the second deadly blaze at a Peruvian rehabilitation facility for substance abusers this year. A January fire at another facility killed 27 people