MCKEESPORT — Authorities say a neighbor was arrested after a fire that damaged a vacant home and an occupied structure next door.

Fire crews in Allegheny County were sent to the McKeesport blaze shortly before 12:30 p.m. Sunday.

Officials said no injuries were reported, but the flames caused damages estimated at $100,000.

Fire Marshal Alvin Henderson Jr. said the blaze was determined to have been incendiary in nature.

He said police “arrested a female neighbor who confessed to setting the fire.”

No charges were immediately announced and officials haven’t commented on the motive for the alleged action.