Muslims from around the world started the Hajj pilgrimage in Saudi Arabia on Friday, with authorities expecting 2 million people to gather this year amid sweltering heat. After circling the Kaaba, the stone cube-shaped holy building inside the Grand Mosque in Mecca, pilgrims head to the nearby Mina valley where they will spend the night in a massive tent city. On the second day, they head to Mount Arafat, around 20 kilometres east of Mecca, where they stay until sunset in what is considered the peak of the Hajj pilgrimage. As the temperature in and around Mecca is expected to reach 43 Celsius,…