Arson is a crime. When someone deliberately sets fire to a building, vehicle, etc. they do not own and they want to cause damage, it is called arson. A person who commits arson is an arsonist. Arsonists usually use gasoline or kerosene to start a fire.
Arsonists use matches, Molotov cocktails and fire starters to start a fire. Arson is common in violent protests and retaliations against the government and other powers.
Julio Gonzalez became one of the most prolific arsonists in history when he set fire to the Happy Land nightclub with only 6 of the 93 occupants making it out alive. Julio started the fire after the bouncer kicked him out late in the evening due to him quarreling with his girlfriend Lydia Feliciano after she recently quit her job there. She was one of the 6 people to survive the fire. The club also came under fire due to the club having no fire escapes or sprinklers.