The mother of 18-year-old Michael Brown, Lesley McSpadden, passionately speaks to a reporter for CNN affiliate KMOV following the shooting death of her son by Ferguson, Missouri police Saturday, August 9, 2014.

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FERGUSON, Mo. (AP) — Police say the FBI is taking over the investigation of a suburban St. Louis police officer who fatally shot an unarmed teenager.

Ferguson Police Chief Tom Jackson tells The Associated Press that he was informed Monday that the FBI was going to take over the investigation into the death of 18-year-old Michael Brown. Jackson says he welcomes the move.

Police say the teen was shot multiple times Saturday in a scuffle with an officer.

Tensions erupted in Ferguson after a candlelight vigil Sunday night. Crowds looted and burned stores, vandalized vehicles and taunted officers who tried to block access to parts of the city. Nearly three dozen people were arrested, though the area was relatively quiet early Monday.

The FBI in St. Louis didn't immediately return a message seeking comment.