Incident Summary:

06/15/2018: An assailant parked a homemade armored car on the Mike O’Callaghan-Pat Tillman Memorial Bridge near the Hoover Dam in Boulder City, Nevada, United States. The assailant, armed with a rifle, stopped traffic on the bridge for approximately 90 minutes. There were no reported casualties in the incident. Mathew P. Wright was arrested in connection with the attack and held up signs during the incident asking President Trump to "release the OIG reports," a reference to a conspiracy theory.



United States

North America

region/u.s. state:


Boulder City

Location Details:
The incident occurred along the Mike O’Callaghan-Pat Tillman Memorial Bridge near the Hoover Dam.

Attack Information
Type of Attack (more) Armed Assault
Successful Attack? (more) No
Target Information (more)
Target Type: Private Citizens & Property
Name of Entity Not Applicable
Specific Description Civilians
Nationality of Target United States
Additional Information
Hostages No
Ransom No
Property Damage No
Weapon Information
Type Sub-type
Firearms Automatic Weapon
Vehicle (not to include vehicle-borne explosives, i.e., car or truck bombs)
Weapon Details
An AR-15 assault rifle and a homemade armored car were used in the attack.
Additional Information
Suicide Attack?No
Part of Multiple Incident?No
Criterion 1 (more) Yes
Criterion 2 (more) Yes
Criterion 3 (more) Yes
Doubt Terrorism Proper (more) No
Perpetrator Group Information
Group Name Claimed Responsibility
Conspiracy theory extremists Yes (Confirmed: Unknown; Mode: Personal claim)
Perpetrator Statistics
Number of Perpetrators 1
Number of Captured Perpetrators 1
Casualty Information
Total Number of Casualties 0 Fatalities / 0 Injured
Total Number of Fatalities 0
Number of U.S. Fatalities 0
Number of Perpetrator Fatalities 0
Total Number of Injured 0
Number of U.S. Injured 0
Number of Perpetrators Injured 0
"Henderson man who parked armored vehicle near Hoover Dam indicted," Las Vegas Review Journal, June 22, 2018.
"Henderson man arrested, identified after holding up Hoover Dam bypass bridge," NBC News 3 Las Vegas, June 15, 2018.
"Henderson man in armored truck on Hoover Dam bypass bridge arrested," Las Vegas Review Journal, June 15, 2018.