A shooter opened fire Wednesday morning during Mass at a Minneapolis Catholic school, killing two children and injuring 17 other people before killing himself, officials said.

The shooting happened during Mass at Annunciation Catholic School. Monday had been the first day of classes.

Of the 17 injured, police said 14 were children. Two of those children were in critical condition.

The shooting comes as school years are starting across the U.S., and some universities have dealt with false alarms about school shootings. At least a dozen college campuses faced hoax active shooter calls — some featuring gunshots sounding in the background.

Here are some of the things to know about the shooting at Annunciation Catholic School.

What do we know about the victims?

The two children who were k

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