A firefighter was injured while fighting a fire at a vacant house in Wolfeboro, N.H. Authorities said 23-year-old Thomas Trask was taken to Dartmouth-Hitchcock Medical Center. His condition and the nature of his injury were not immediately known. The Wolfeboro Fire Department responded to the fire shortly after 2 a.m. Sunday and had it under control about 3:30 a.m. The state fire marshal’s office is assisting the department in investigating the cause of the fire.