The man suspected of sending pipe bombs to prominent Democrats and other opponents of President Donald Trump kept a list of elected officials and others who investigators believe were intended targets, an official told The Associated Press on Monday.

The official said authorities had recovered soldering equipment, a printer, and stamps similar to those used on the package bombs in the investigation into 56-year-old Cesar Sayoc, who was arrested last week in Florida. Authorities believe Sayoc was putting explosives together in his van.