More than 20 guns are registered to the father of Donald Trump’s assassin, Thomas Matthew Crooks, according to records reviewed by authorities. According to statements by the authorities to CNN, all the registered weapons were purchased legally.

At the same time, during the searches on the body of the attacker, the authorities found that he was carrying a transmitter while in a search of his car they discovered a receiver with wires entering a metal box that possibly contained explosives in the trunk of the Hyundai Sudan that was found parked at the Butler Farm Show Grounds.

Investigators are trying to determine whether a remote control linked to a possible explosive device in the gunman’s car was part of the murder plan.

One theory authorities are considering is whether the attacker intended to detonate the explosives in his car as a distraction tactic, drawing attention and security personnel away from Trump, CNN reported citing sources in the investigation.

The fact that the attacker was spotted by civilians and confronted by a local police officer who tried to reach the roof may have led him to hasten his plan and bypass the detonation of the explosive device.