Four people, including two young children, have been left "shaken" after an arson attack at a house in Lurgan, County Armagh, police have said.
The fire happened in the Wellington Street area at about 23:45 GMT on Friday night.
The front door and hallway of the house were damaged. The four people in the house - a man, woman and two children - were not injured.
A 26-year-old man is assisting police with their enquiries.
The PSNI has appealed for witnesses.