They can occur any time, said Willard. 보통은 불을 지르고 싶은 욕구를 느끼는 한 사람이나 특정 물건에 불을 지르는 경우가 많습니다. If that person is identified, and charged, the arsons may stop for a bit, and then you get someone who wants to be a copycat and they start up again.