The search for the missing after an explosion at a Tennessee ammunition plant has become a search for their remains, officials said Saturday.

No survivors have been found at the site of the blast that occurred Friday, local authorities said, adding that more than 300 emergency workers had scoured the ruins. Sixteen people remained missing Saturday.

The explosion occurred at a plant owned by Accurate Energetic Systems, which produces explosives and demolition charges for the U.S. military.

The recovery process has been slow, said Sheriff Chris Davis of Humphreys County, Tennessee, at a news conference Saturday, as bomb technicians and explosive specialists worked to ensure that the scene was safe for law enforcement officers to continue the investigation.

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