At least 100 federal investigators are responding to an attack in Michigan where a former Marine crashed a pickup into a Church of Jesus Christ of Latter-day Saints chapel during a Sunday service, shot into the building and set it on fire.

Four people were killed and eight more were wounded by gunfire. Officers were on the scene within 30 seconds after the 911 call and eventually shot the attacker.

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 was also 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, kill

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