On April 24, two Chinese citizens working for Chinese contractor Sinopec Shanghai Engineering died instantly when the roof of a large storage tank collapsed. Four other workers, also from China, were injured.The investigation into the April collapse is expected to take months.
Nobody was near the tank that collapsed Saturday because a stop-work order from the April accident was still in effect, Frey said. 'There wasn't any work going on the site.'Saturday's collapse will be examined as part of the investigation that was launched in April, he said.