Police in Virginia Beach cannot determine a motive for a city engineer's rampage in 2019 that killed 12 people in the municipal building where he worked, according to the city's final investigative report released Wednesday...

A list of some of the deadliest mass shootings in the United States in the last two years:

A list of some of the deadliest mass shootings in the United States in the last two years:

A list of some of the deadliest mass shootings in the United States in the last two years: