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MINNEAPOLIS, Minnesota ( WCCO ) -- As many as 20 people were injured in a shooting at Annunciation Catholic School in south Minneapolis Wednesday morning, according to two federal law enforcement sources.

Sources tell CBS News that the shooter died of an apparent self-inflicted gunshot wound.

The shooting triggered a massive law enforcement response at 54th Street between Harriet and Garfield avenues. Minneapolis police said there is no active threat to the public.

Authorities say there will be a news conference at 10:30 a.m.

Federal sources say the shooter, a man, was wearing all black and carrying a rifle. Authorities are searching for any additional weapons.

The shooting started around 8:45 a.m. According to a school schedule, there was an al

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