Authorities say one person was killed and two firefighters were hurt in a house fire in Blair County Tuesday evening. Emergency dispatchers say the fire broke out at a home along East 5th Ave., near Jefferson Park, sometime around 6:30 p.m. The Altoona Fire Department says the fire was upgraded to second alarm, and the home is a total loss. The condition of the two firefighters who were hurt is unknown at this time. The cause of the fire is under investigation.