OAKLAND (CBS SF) — Fire officials say fireworks sparked a brush fire in the Oakland hills.

Battalion Chief James Bowron of the Oakland Fire department says the fire broke out Saturday afternoon near a city park trail, not far from the Chabot Space and Science Center.

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The fire, burning in the vicinity of 5675 Castle Drive, was upgraded to two alarms, according to the Oakland Fire Department.

It was first reported at 3:50 p.m. and upgraded at 4:04 p.m., fire dispatchers said.

The blaze grew to 3 acres and threatened two homes near Joaquin Miller Park before firefighters contained it. It sent a large plume of smoke that could be seen miles away.

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Investigators found remnants of fireworks near where the fire started.

The hillside area in the northern part of Oakland was devastated by a firestorm in 1991 that killed 25 people and destroyed more than 3,000 homes and apartment units.

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