No charges filed over Chile mine collapse

(CNN) -- Who's to blame for the mine collapse that trapped 33 workers underground for months in Chile?

No one, according to prosecutors, who closed the case Thursday after a lengthy investigation.

Nearly three years after the collapse at the San Jose mine in Copiapo, Chile, prosecutors said, there's not enough evidence to file criminal charges.

The 2010 mining accident drew global attention as word spread that the workers had survived and rescuers worked for weeks to free them.

For 17 days after the collapse, nobody knew if they were alive. The miners spent 69 days underground before they were rescued.

"This was a complicated case, which is why it took us so long to make this determination," regional prosecutor Hector Mella Farias said. "And I want to be clear in saying that everything to collect evidence that the law allows was done."

"Today we heard the decision, as did many of our colleagues, and many of them are extremely shocked," said Luis Urzua, the miners' shift boss and the last man rescued from the mine . "Because this is something that places responsibility upon the mine owners, because they are the entity that must supervise what happens. As supervisors, they should have prevented it. They should have known what sectors were at risk of collapsing."
The miners want future accidents to be prevented, he said, and they want the mine's owners to be held accountable.