An Egyptian woman mourns over a coffin which allegedly contains the body of one of the 37 Islamist prisoners who suffocated on tear gas that was fired after they took an officer hostage on their way to a main prison, at the Zeinhom Morgue in Cairo on August 19, 2013. Militants killed 25 policemen in the deadliest attack of its kind in years, as Egypt's army-installed rulers escalated a campaign to crush ousted president Mohamed Morsi's Muslim Brotherhood. The assailants fired rocket-propelled grenades at two buses carrying police in the Sinai Peninsula, sources said, just hours after 37 Brotherhood prisoners died in police custody. AFP PHOTO/STR        (Photo credit should read STR/AFP via Getty Images)