Investigators said they would question concert organizers over reports that more than 10,000 people were crammed into the open-air stadium, built to hold only 6,000.

There are also reports that the building had only one unlocked exit.
 
Sergeant Slamet, a local policeman, said the victims were "trampled to death" as the crowd turned "very rough and began pushing".
 
Indonesia has witnessed similar deadly stampedes at concerts in recent years.