Demolition work has begun on the Civic Arena, the igloo-shaped former home of the Pittsburgh Penguins. A preservation group failed in its efforts to get courts to keep the building from being torn down so it could be reused. The city-county Sports & Exhibition Authority says crews will work until about May to tear down the building, which for a time was called Mellon Arena. It's across the street from the Penguins' new arena, Consol Energy Center.