The Maui Fire Department said two brush fires in Pukalani on Monday night may have been started under suspicious circumstances.

The fires, at Old Haleakala Highway and the new Haleakala Highway bypass, burned a combined 3,500 square feet, and were reported at 11:49 p.m.

When firefighters arrived at the scene Monday, they found one fire burning on the north side of the bypass and the other on the south side.

The southern fire scorched about 1,500 square feet, and the fire on the north side spread to about 2,000 square feet. Both were extinguished by 12:35 a.m. Tuesday.

Fire officials said there were no witnesses, but how the fires started appears suspcious.