Altoona firefighters are investigating the cause of a house fire that broke out Tuesday evening on Beech Avenue. Responding to a call just after 7:30 p.m., crews arrived at the 200 block to find flames engulfing the front of a house. The fire caused heavy damage to about 50% of the home, according to the Altoona Fire Department chief. While the blaze was contained before it could spread, houses on either side sustained minor siding damage. No injuries were reported from the incident.