WASHINGTON — U.S. leaders are reacting to a deadly mass shooting at a Minnesota Catholic school that killed two children and injured at least 17 people, calling the attack a "terrible situation."

The Minneapolis Police said the shooter began firing from outside the church, shooting through the windows of a church where schoolchildren were sitting for an all-school mass.

Monday was the first day of school, and social media photos from that day show students in green uniforms greeting each other at bicycle racks, smiling for the camera and sitting together.

Details about the shooting are still emerging, but at a Wednesday morning press conference, law enforcement officials confirmed that two children, ages 8 and 10, were killed in the attack. At least 17 more people, including 14 child

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