SALT LAKE CITY — At Monday’s news conference in Michigan on the deadly shooting and fire at a meetinghouse of The Church of Jesus Christ of Latter-day Saints, police echoed a familiar refrain from law enforcement.

“While we are committed to keeping our community safe, we also need your help,” said Col. James Grady, director of Michigan State Police. “We are asking our communities to stay vigilant, and if you see something suspicious, please contact local law enforcement or 911 immediately.”

Grady offered statistics.

“53% of mass attacks leave a trail of clues leading up to them,” he told reporters. “Two-thirds of mass attackers elicited behaviors that caused concerns.”

What is concerning enough to be reported to the police?

Chris Bertram, a retired deputy police chief, said inflamma

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