Trump rally shooter Thomas Matthew Crooks purchased 50 rounds of ammunition just hours before the incident, according to reports. 

Crooks, 20, bought the bullets from local gun shop Allegheny Arms before opening fire at former President Trump in Butler, Pennsylvania, on Saturday evening, the Pittsburgh Post-Gazette reported.

FBI officials had not yet confirmed the report as of Tuesday morning, but noted that they've completed a vetting of Crooks' phone.

"The search of the subject’s residence and vehicle are complete. The FBI has conducted nearly 100 interviews of law enforcement personnel, event attendees, and other witnesses. That work continues," the FBI said in a statement.... Read More: FOX News