Kinda felt like a zombie movie
Urban chaos, people running, screaming and getting slaughtered everywhere. Authorities are overwhelmed so the heroes are on their own. Doors being barricated, the heroes try to move silently but someone in the group ends up doing something stupid that alerts the horde. The heroes disguise themselves to blend into the horde. They reach the place where they expected to be rescued, only to find out it has also been overrun.
If this movie had been released in the mid 2000's it would have been an excellent zombie flick