The Maine Fire Marshal’s Office says a 16-year-old boy has been detained following a fire at the Winthrop library. Lt. Joseph Thomas of the Fire Marshal’s Office says the fire at the C.M. Bailey Library was detected by a police officer soon after it broke out around 2 a.m. and damage was kept to a minimum. The fire originated in the library’s boiler room. An investigation shows that the fire was intentionally set. The teenager from Winthrop was referred to juvenile justice authorities.