LOS ANGELES — The 29-year-old man accused of sparking one of the most destructive wildfires in Los Angeles allegedly threatened to burn down his home in Florida last month during an argument with a relative and then showed his father a gun, according to federal prosecutors.

Jonathan Rinderknecht appeared in a Florida federal courtroom Thursday, one day after federal agents arrested him at his home outside Orlando, Fla. He was taken into custody 10 months after the wind-driven Palisades Fire, which destroyed thousands of homes and killed 12 people.

Prosecutors allege that Rinderknecht “maliciously set” a brush fire just after midnight Jan. 1 that eventually grew into the deadly inferno. He allegedly remained in the area after he set the fire, repeatedly called 911 and then offered to help

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