BOYLE HEIGHTS ( — An arson investigation was underway Wednesday at a high school in Boyle Heights.

The blaze erupted around 4 a.m. inside two portable classrooms located on the Roosevelt High School campus on South Matthews Street, according to the Los Angeles Fire Department.

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Firefighters were able to extinguish the flames within 15 minutes.

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No injuries were reported.

Authorities said the incident will not impact school today.

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The cause of the fire remains under investigation.