A couple and their baby managed to escape from a blazing block of flats in Greater Manchester after arsonists set it alight.
The one-year-old boy, his mother, 23, and father, 26, were treated for smoke inhalation after fleeing the building on St James Street, Heywood, Rochdale.
The arsonists set fire to a landing, causing smoke to spread throughout the block, at about 2200 GMT on Friday.
Police said the attack "could have ended in tragedy".
The offenders are believed to have got inside the inside the building through an unlocked doorway.
Det Con Ben Harris said: "This was an unprovoked and cowardly attack which could have ended in tragedy had the occupants not realised the building was on fire.
"Unfortunately we do not have descriptions of those responsible for this crime and I would urge anyone who may have seen something suspicious to contact police."