FONTANA (CBSLA.com) — Investigators sought the public’s help Tuesday to provide information regarding two separate pallet yard fires that erupted within days of each other in Fontana.

According to the San Bernardino County Fire Department, detectives have determined arson to be the cause of a second-alarm fire that erupted in the 15600 block of Boyle Avenue on Sunday night.

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Firefighters aggressively attacked the blaze from all sides and were able to contain the flames in just over an hour and a half. No injuries or evacuations were reported.

No arrests have been made in connection with setting the fire.

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A second-alarm fire that erupted on Wednesday morning at the Woodland Pallets yard remains under investigation. At this time, arson has not been ruled out as a cause of the fire.

Damage estimates for both blazes have not yet been determined.

Authorities have not clarified if the two fires are related.

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Anyone with information regarding either pallet yard fire has been urged to contact the San Bernardino County Fire Department at (800) 472-7766 or (909) 356-3805.