At least 717 people have been crushed to death in a stampede outside Mecca and more than 850 injured in the deadliest disaster on the annual hajj pilgrimage in a quarter of a century.  Related: Hajj pilgrimage stampede: a visual guide to the fatal crush near Mecca  Panic broke out when two groups of pilgrims preparing for one of the last major rites of their trip collided at the intersection of two narrow streets. Within minutes the tarmac was a macabre jumble of dishevelled, partially clothed bodies.  The disaster revived questions about Saudi Arabia’s ability to manage the world’s largest annual migration, and the tragedy turned political as officials and diplomats began trading recriminations even before rescue operations had wound up.  The Saudi monarch, King Salman, ordered a review of the kingdom’s plans for the hajj after the disaster. Speaking in a live speech broadcast by Saudi-owned al-Arabiya television, he also said he had asked for a swift investigation into what he described as a painful incident.  Tehran accused Riyadh of failing its pilgrims after it emerged that dozens of the dead were Iranian, while some Saudi politicians appeared to push blame on to the dead themselves, with one reportedly making racist comments about African pilgrims.  The scale of the disaster was so vast that rescue teams worked into the evening to evacuate the injured and bodies of the dead, while security forces kept order among the thousands of pilgrims still filing through the area to finish their rituals.  Survivors described losing their loved ones and their clothes, in a frantic scrabble to escape the deadly crush as it surged down a narrow street with no exits. The toll may rise further, Al-Arabiya television channel quoted the interior ministry saying.  “I saw someone trip over someone in a wheelchair and several people tripping over him. People were climbing over one another just to breathe,” said one of the survivors, 44-year-old Egyptian Abdullah Lotfy.  “It was like a wave. You go forward and suddenly you go back,” he told the Associated Press. Other survivors recounted being turned back from the entrance to tented camp areas as the crowd surged behind them.  “I saw the pilgrims were falling down and getting crushed and heard women and elderly people were screaming, asking for help,” said one survivor, who gave his name as Dr Abdulrahman. “I tried very hard to get out, I lost all my clothes, they were torn off but I didn’t care and I managed to get out”.  “Then I tried to get in one of the tented camps but I was blocked by the security forces who kept preventing anyone from entering, and that doubled the crisis.”  Abdulrahman eventually collapsed into a camp area when a security guard was distracted, and resisted attempts to throw him back out. But he said authorities were slow to arrive to calm the chaos.  “I saw the civil defence there but they were very late,” he said. “I realised that there was a shortage of emergency exits, because there supposed to be ways of getting off a road every 50 metres.”  The tragedy came just weeks after a crane collapse killed more than 100 people and injured more than 200 more in the same area, and two hotels had to evacuate thousands of guests when major fires broke out, also injuring some pilgrims.  The string of major accidents has revived concerns about management of the hajj pilgrimage, which brings more than 2 million people to the holiest sites in Islam each year. Thousands of visitors have died in fires, stampedes and other disasters in recent decades.  Saudi Arabia’s king is also known as the Custodian of the Two Mosques, an acknowledgement of his role protecting pilgrims and the sites they visit.  The crown prince ordered an investigation into the causes of the stampede, but other officials were quick to shrug off any suggestion of official failings even before the rescue operations had finished.  The Saudi health minister, Khalid al-Falih, pointed a finger of blame at the dead themselves, saying the pilgrims had been undisciplined.  “The accident, as most know, was a stampede caused by overcrowding, and also caused by some of the pilgrims not following the movement instructions of the security and hajj ministry,” he told a local TV channel.  High temperatures and exhaustion among may have contributed to the disaster, military spokesman Maj Gen Mansour al-Turki said, but he added there was no indication authorities are to blame. “Unfortunately, these incidents happen in a moment,” the Associated Press quoted him as saying.  Prince Khaled al-Faisal, head of Saudi Arabia’s central hajj committee, drew criticism on social media after reportedly blaming the fatal crush on “some pilgrims with African nationalities”.  Furious officials in Tehran accused local authorities of poor management of pilgrims in an area notorious for overcrowding, after it emerged that as many as 90 of the dead, or one in 10, may be Iranian. “Saudi Arabia’s officials are to blame for the incident,” said Amir Abdollahian, Iran’s deputy foreign minister for Arab and African affairs. He has summoned the Saudi envoy in Tehran over the deaths.  The two countries are old enemies, whose mutual distrust is amplified by sectarian differences. They have vied for regional influence for decades and are backing opposite sides in the wars in Yemen and Syria.  Related: Mecca: hajj crush kills hundreds near holy city – live coverage  Thursday’s stampede was the worst disaster at the hajj since a similar tragedy in 1990, when more than 1,400 people died after panic broke out among crowds inside a tunnel.  The trip is one of the five pillars of Islam – it is a religious duty for able-bodied Muslims to make the journey at least once. Numbers were once limited by the duration and difficulty of a trip to Mecca, but rises in income and cheaper air travel has put thepilgrimage within reach of many more Muslims worldwide.  Thursday’s tragedy unfolded in Mina, a dusty, overcrowded valley a few miles outside Mecca where a temporary city of 160,000 tents houses more than 2 million people for a few days each year.  Its huge crowds have long given the area a grim reputation as one of the most dangerous parts of the pilgrimage. All pilgrims on the hajj must file through on a single day to participate in a symbolic stoning of the devil.  Thousands of people have died in stampedes and fires on its cramped streets in recent decades, but after more than 300 people died in a crush in 2006, Saudi Arabia stepped up investment in safety.  They spent millions on improvements, including expanding the “bridge” where pilgrims throw pebbles at three walls in a symbolic stoning of the devil into a multi-storey building with entrance and exit ramps.  Helicopters and surveillance cameras monitor crowd movements, and a strict assigned schedule is intended to control when pilgrims filter through the most crowded areas.  For nearly a decade there were no major accidents, but local activists said disorganisation and corruption meant a breakdown of the system was inevitable.  “We are not that much surprised at the accident. We are expecting worse every time,” said one Mecca-based Saudi activist, who asked not to be named because of fears the authorities would punish political dissent.  He pointed out that in 20 years of rapid expansion and development around Mecca, authorities built only one new hospital to serve pilgrims, and had not installed a single fire extinguisher in the city’s Grand Mosque.  “Maybe it is not normal in other countries, but on account of the corruption that’s going on here in our country anything can easily make a disaster for us. We should expect worse and worse.”  Additional reporting by Hugh Miles.
Crush in Mina valley, the site of a vast tent city of pilgrims, leaves more than 800 others injured