LINCOLN, Neb. (AP) — Police have arrested a 19-year-old man they believe started a fire outside his girlfriend’s mobile home in Lincoln.

Firefighters were called to the blaze around 12:30 a.m. Monday — the fourth time in less than a month they had been called to the trailer park for a fire.

Investigators say the man moved to the mobile home park about a month ago, around the same time the string of fires there began. One of the fires on July 4 killed a dog.

The man, who has not yet been formally charged, was convicted in 2013 of arson and sentenced to a year in jail for starting a fire in the basement of a vacant Lincoln home.