A DELTA co-pilot has been arrested and cops were reportedly seen storming the cockpit after the passenger plane landed. 

Around 10 agents, some from Homeland Security, boarded the plane after it landed at San Francisco airport on Saturday. 

The plane had taken off from Minneapolis airport earlier in the day, as reported by the ABC affiliate KGO-TV. 

Travelers were preparing to disembark when they saw the commotion at the front of the plane.

“We were all shocked and stunned. What was happening?” one passenger, known as Sarah, said.

Sarah documented what unfolded on board the aircraft.

“They barged through and stormed the cockpit,” she said.

“They removed the co-pilot, cuffed him, presumably arrested him.”

Sarah said the co-pilot was then flanked by officers, walked down the aisle, and taken off the plane.

She recalled how the cabin crew seemed bewildered by what was going on.

“I looked at him and I said ‘What’s going on?'” one told the Fox affiliate KMSP-TV.

The traveler said passengers were standing up on the plane getting ready to grab their bags from the overhead lockers.

Another passenger told The San Francisco Chronicle that some of the agents who stormed onto the plane were carrying guns.

The traveler said the agents had badges and vests with letters on them.

Once the co-pilot was taken off the plane, some agents then re-boarded the aircraft to collect his belongings.

“This is an ongoing local investigation with the Contra Costa County Sheriff’s Office,” a Homeland Security spokesperson told The Chronicle.

Delta officials are yet to issue a statement.