Joseph Emerson, the off-duty Alaska Airlines pilot who authorities say caused a San Francisco-bound flight to make an emergency diversion to Oregon by attempting to shut off the engines midflight, also tried grabbing the handle of an emergency exit while flight attendants were detaining him, federal prosecutors said Tuesday.

Emerson, who is already facing attempted murder charges in the incident, has now been charged in federal court with one count of interfering with flight crew members and attendants, the U.S. attorney’s office in Oregon announced in a statement Tuesday.

A flight attendant told responding officers that Emerson said he “tried to kill everybody,” according to the criminal complaint filed Tuesday.

“I messed everything up,” Emerson said, according to the court documents.

Emerson was sitting in the jump seat of the cockpit of Alaska Airlines Flight 2059 on Sunday when he allegedly tried to activate the plane’s emergency fire suppression system, which would have cut off fuel to the engines, prosecutors said.

When Emerson attempted to grab and pull on the two red handles that would have activated the system, he and the pilots got into a brief struggle in the cockpit, prosecutors said. Emerson then left the cockpit and peacefully walked to the back of the plane, telling one flight attendant he “just got kicked out of the flight deck,” according to the court documents.

“You need to cuff me right now or it’s going to be bad,” Emerson told the flight attendant, according to the documents.

Flight attendants put Emerson in wrist restraints and seated him in the back of the plane. As the plane was making its descent to Portland’s airport, Emerson tried to grab the handle of an emergency exit, prosecutors said. A flight attendant placed her hands on his to stop him.

This is a breaking news story. Check back for updates.