GRAND BLANC, Mich. — At least 100 federal investigators are responding to an attack in a Michigan community where a former Marine crashed a pickup into a Mormon church during a Sunday service, shot into the building and set it ablaze.

The police chief said officers were on the scene within 30 seconds after a 911 call and eventually fatally shot the man, who killed four people and injured eight more.

It was the latest of many shooting attacks on houses of worship in the U.S. over the past 20 years, including one in August that killed two children during Mass at the Church of the Annunciation in Minneapolis .

It also was the second mass shooting in the U.S. in less than 24 hours. On Saturday night, another former Marine opened fire from a boat into a crowd in Southport, North Carolina, ki

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