OAKLAND, Calif. — Two men were charged on Monday with 36 counts of manslaughter in a deadly fire at an Oakland warehouse in December.

The men — Derick Almena, the leaseholder, and Max Harris, who assisted him in a supervisory role in the building — were arrested on Monday in connection with the fire, said Nancy E. O’Malley, the district attorney of Alameda County, who brought the charges.

[Ghost Ship Trial: Jury acquits one man and can’t reach verdict on the other.]

The warehouse, which was illegally occupied, was the site of the nation’s deadliest structural fire in more than a decade. Most of the victims were attending a party on the second floor and were unable to escape down a makeshift staircase.