SAN JOSE — A wildfire sparked early Thursday morning off Sierra Road just north of Alum Rock Park and burned about 10 acres, according to fire officials.

San Jose firefighters at the scene told ABC-7 the blaze may have been sparked by fireworks.

About 70 firefighters from the San Jose Fire Department and Cal Fire responded to the blaze, which was reported at 2:28 a.m. near the Sierra Vista Open Space Reserve, according to Capt. Chris Salcido.

Fire crews had the blaze under control at 5:01 a.m., Salcido said.

Contact Mark Gomez at 408-920-5869 and follow him at Twitter.com/MarkMgomez.