Sharon police are investigating a vacant house fire on Walnut Street that broke out just before 11 pm on Thursday night.

The flames spread to a house next door that had two people inside.

According to firefighters and police, both people are OK, but their home was badly damaged and the Red Cross was called in. 

In the beginning of August, a juvenile was arrested for starting a string of fires around Dock Street.

Sharon's fire chief, Bob Fiscus, told 21 News it's likely those fires are related to the one that happened on Thursday.

This fire is under investigation.