LOS ANGELES — Police have arrested a man they say jumped a fence and ran onto a runway at Los Angeles International Airport.

Airport police Officer Rob Pedregon says the man was spotted running across the runway about 1:40 p.m. Monday near a Delta Airlines jet that was preparing to take off.

A passenger, Chad Ridgely, tweeted that the man started doing pushups before he was arrested.

Pedregon say the intruder is a middle-aged homeless man with mental health problems. The officer says he scaled a 10½-foot-tall perimeter fence topped with barbed wire with a concrete barrier at the base.

The runway was closed about 20 minutes, and the plane was given a mechanical check before it was allowed to depart.

The breach is being investigated.