Thousands of people in Kuwait attended a mass funeral procession on Saturday for 27 victims of a Shiite mosque bombing claimed by the self-proclaimed Islamic State in Iraq and Syria (ISIS) a day earlier.Braving the hot summer temperatures, mourners from as far as eastern Saudi Arabia and Bahrain attended the funeral and carried the Kuwaiti flag; others carried a simple black flag to signify mourning. Some in the crowd chanted, "Sunnis and Shiites are brothers!"Women ululated to praise those who had been killed during prayer and in the holy Muslim month of Ramadan now in its second week claiming they died as martyrs. They threw rose petals at the bodies, which were shrouded in the Kuwaiti flag.To help people keep cool, a young man was seen misting people's faces with water. Still, paramedics were on hand to assist those who fainted from the heat as temperatures reached 107 degrees Fahrenheit (42 degrees Celsius).Not all those killed in the bombing were buried in Kuwait. Some were sent to be buried in Najaf, Iraq at a Shiite holy site that is believed to be blessed. Iran's Foreign Ministry said three Iranians were among the 27 people killed in the attack.The attack was carried out by a suicide bomber during midday Friday prayers inside one of Kuwait's oldest Shiite mosques.