Hajj - 5,000 CCTV cameras watch over one of the world's biggest crowds

 Saudi Arabia has deployed 100,000 security personnel to oversee the annual Islamic Hajj pilgrimage .Roughly 3million people from around the world are expected to converge  at the Kaaba, in Mina and other nearby areas for the Hajj, which lasts about five days. It is series of rituals meant to cleanse the soul of sins and instill a sense of equality and brotherhood. All able-bodied Muslims are required to perform the hajj once in their lives.

Four members of the government's 100,000-strong security force keep an eye on just a handful of the 5,000 CCTV cameras operating.

Members of an elite counter terrorism unit, traffic police and emergency civil defense personnel are among those deployed.