"The festival, which drew about 1.4 million people, was not immediately cancelled because authorities feared that could spark a second panic and more chaos at the crowded venue."
At least 15 dead inside a tunnel after mass panic broke out due to overcrowding.
The New York Times carries the Reuters story, with photos and video. Terrible.
This sort of thing seems to happen once a year or so somewhere in the world. No matter how advanced our technology, this danger will persist whenever large, dense crowds of people amass.
Obviously, the music festival organizers should have been better prepared to manage the crowd size and flow of people.