Right at Your Door (2006)

One morning, like every morning, Brad (Rory Cochrane) says goodbye to his wife Lexi (Mary McCormack) as she leaves for work. Soon after a series of bombs go off around the city and the media chalk them up to terrorists. The bombs create a toxic gas cloud and all roads and other means of communication are rendered completely useless. The Government obliges citizens to seal off their homes and advises everyone to stay inside so they don’t get infected.