New London — Police and fire personnel believe that a fire in New London on Saturday was a case of arson.

According to a news release from New London Fire Marshal Vernon Skau, the two-alarm fire at 69 Rosemary St. on Saturday evening "has been determined to be intentionally set by someone."

Five people were displaced, and two firefighters were injured in the fire, which tore through a multifamily home.

City fire Chief Tom Curcio said the fire was first reported at 10 p.m., and firefighters arrived to find heavy fire with flames already moving into the second floor and attic of the two-story home. No injuries among the five occupants were reported, but there was substantial damage to the first and second floors and roof, he said. The fire was knocked down by 10:45 p.m.

City records show the home is owned by Old Lyme-based Sunshine Investments whose principal is Elizabeth Sunshine.

Skau asked that anyone with information about the fire call the Arson Tip Line at 1-800-842-7766. There could be an award of $2,500 for information leading to an arrest or conviction of the perpetrator.