The Oversight Project conducted an in-depth probe of mobile advertising data to determine the movements of Thomas Matthew Crooks and his associates in the lead-up to the assassination attempt on Donald Trump.

Numerous devices "regularly visited" both the home and workplace of Crooks, the Oversight Project found. One of them, tied to a specific individual, also visited a building in Washington, D.C., located in Gallery Place near the offices of the Federal Bureau of Investigation (FBI) on June 26, 2023.

Another device linked to Crooks also visited Plymouth, Mass., via a Pittsburgh to Boston flight in early March of this year. That device stayed at Hotel 1620 Plymouth Harbor from March 1-3, 2024.

Another device linked to Crooks' work traveled to Butler, Penn., on July 4 and July 8. That device stopped transmitting all activity on July 12, just a few weeks before Trump would hold a rally in Butler at which he reportedly got shot in the right ear.

Another device linked to Crooks visited Allegheny Arms & Gun Works, a gun store, on Aug. 30, 2023.