No-one was harmed in the attack on the charity, which is being treated by police as arson.
Authorities are asking for the public’s help to find a suspect, 26-year-old Darren William Beach Jr, who police say is 6’2″ and around 280 pounds.
One.n.ten executive director Linda Elliott told local news site azcentral.com that Beach used to take part in one.n.ten programmes, but is now too old for the service.
Because he is a previous participant, police are not treating the incident as a hate crime.
Elliott said her first reaction to the video was “shock.