Third Boston Marathon explosion a controlled detonation, according to police scanner

Boylston Street and Copley Square - Google Maps

Officials detonated an item near the Boston Marathon's original incident scene.

Boston law enforcement indicated on the emergency personnel radio scanner at 3:53 p.m. ET that they would be conducting a controlled explosion on the 600 block of Boylston Street, near the Copley Square site of the original explosions that rocked the Boston Marathon earlier Monday afternoon. The explosion occurred around 3:55 p.m. ET.

Other updates from emergency personnel scanner since 3:30 p.m. ET:

  • The incident command is set up at the Westin Hotel.
  • "[Placing injured into ambulances] phase seems to be over."
  • Personnel on the channel suspect the devices may have been placed in trash barrels. "All officers coming into the area are to be cautious of trash containers."
  • Emergency personnel is trying to move a busload of runners at the Mass Avenue underpass.
  • Outside incoming agencies will stage at Ring Road and Huntingdon.
  • No cell phone use, as cell towers are overloaded.
  • At 3:50, a call was placed for more explosive dogs and swat team members.
  • At 3:52, armored trucks were en route.
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