Prison staff carrying riot shields leave HMP Birmingham in Winson Green, Birmingham, central England on December 17, 2016. British riot police, late Friday evening, regained control of a prison after more than 300 inmates took part in a "serious disturbance" that led to a partial lockdown. A specialist "Tornado Team", which handles prison riots, was sent in to deal with the incident at the privately run prison in Birmingham, central England. / AFP / OLI SCARFF (Photo credit should read OLI SCARFF/AFP/Getty Images)