(CNN) — The families of the 16 victims killed in the devastating blast at a Tennessee explosive plant have been notified, authorities said at a Saturday news conference.

No one has been found alive in the search and investigators are working through the scene foot by foot, Humphreys County Sheriff Chris Davis said.

“At this time, we have not located any survivors, and we are making the assumption that all are deceased at this point,” he said Saturday evening.

Earlier, officials thought 18 people were missing because their vehicles and personal items were at the facility, but they were later able to locate two people off site, officials said.

“We’re moving to recovery,” Davis said with emotion during a news conference one day after the blast, his voice trailing off at times.

“As we ge

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