FBI has "strong evidence" that the email shared on Shawn Ryan's show is authentic

NEW: FBI says they have "strong evidence" that the email shared on Shawn Ryan's show *was* sent by Livelsberger before the explosion.
The statement was made just 1 hour after Ryan released the episode.

In the email, the individual believed to be Livelsberger said the NJ drones were operated by a "gravitic propulsion system."

The email suggested that the drones could have been operated by China.

"What we have been seeing with "drones" is the operational use of gravitic propulsion systems powered aircraft by most recently China in the east coast, but throughout history, the US," the email claims.

"Only we and China have this capability. Our OPEN location for this activity in the box is below. China has been launching them from the Atlantic from submarines for years, but this activity recently has picked up."

"As of now, it is just a show of force and they are using it similar to how they used the balloon for sigint and isr, which are also part of the integrated coms system. There are dozens of those balloons in the air at any given time."

Investigators have not yet said what Livelsberger's state of mind was at the time of the incident.