Suspect appears to have used encrypted email to sign up for Trump rally: Source
Using an encrypted email address and cell phone number, someone using the name Thomas Matthew Crooks signed up online to attend Trump's Pennsylvania rally one week before the shooting, a source familiar with the matter told ABC News.
The FBI told lawmakers they've conducted 200 interviews as part of the investigation, a source said.
A search of Crooks' phone history revealed no indication of his political views, and investigators were still trying to determine his motive.
An FBI spokesperson did not respond to an email from ABC News seeking comment.
-ABC News' Will Steakin and Mike Levine