The Purple Haze

In the small town of Leyland, a group of thieves plan to pull off their
final job and steal three million pounds from a bank. The job seems to
be a success, until the alarm is tripped and the police surround the
building. A standoff ensues, and the police try to negotiate a
resolution before the thieves begin to kill their hostages. Things
take a strange turn, however, when an eerie purple mist renders everyone
unconscious. When people begin to wake up, they find that they are
among only a small few who haven’t been killed and mutilated by the
mist. Then, the dead return to feed on the living, forcing the surviving
police, thieves and hostages to band together in bitter struggle for
survival.