(CBS) — A gas man break forced homeowners out into the cold in the South Austin neighborhood late Tuesday afternoon.

The leak happened about 5:40 p.m. in the 300 N. Mason and approximately half the have been evacuated, according to the Chicago Fire Department. A Water Department crew was working on a water main when it hit a two-inch plastic gas main.

Warming buses were brought out for the affected residents. Shortly before 6:30, the Hazmat was secured and people began returning to their homes.