MINA: King Salman arrived in Mina on Saturday to oversee facilities for Hajj pilgrims and ensure that they are comfortable.   Almost 2.5 million Muslims from all over the world are participating in Hajj, one of the largest annual global gatherings. On Saturday, pilgrims spent the day in Arafat where it rained heavily during the afternoon. After sunset, they made their way to Muzdalifah.  Muslims who are not performing Hajj will celebrate the first day of Eid Al-Adha, or the Feast of Sacrifice, on Sunday.  King Salman was received at Mina Palace by several senior officials, including Interior Minister Prince Abdulaziz bin Saud bin Naif.