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Virginia Tech shootings: Huge police response

The law enforcement response to the shootings at Virginia Tech is enormous. Here's a breakdown of who's on the scene looking for a white male wearing gray sweatpants, a neon cap and a hoodie and carrying a grey backpack, as compiled by msnbc.com:

  • Virginia State Police, who are in charge of the investigation
  • Agents of the Bureau of Alcohol, Tobacco, Firearms and Explosives
  • FBI agents
  • Campus police
  • Roanoke police tactical units
  • Montgomery County police tactical units 
  • Blacksburg police
  • Christiansburg police
  • Pulaski County sheriff's K9 unit

Other nearby agencies say they are on standby in case they are needed.

Staffers, students under lockdown at Virginia Tech: Shooting brings back '4/16'

Get updates on the fatal shootings at Virginia Tech