The death toll from the UPS cargo plane crash in Louisville, Kentucky, has risen to 13, officials said Thursday.

"On my way to the Teamsters' vigil, I learned of a 13th person that died as a result of the UPS flight 2976 plane crash," Louisville Mayor Craig Greenberg wrote in a social media post. "My heart is with the families, friends and colleagues of all who were lost in this week's tragedy. We will get through this together."

None of the crash victims have been positively identified by the local coroner yet, National Transportation Safety Board officials said during a news briefing Thursday afternoon. Earlier Thursday, Greenberg said nine people were still unaccounted for following the crash.

On Wednesday, the University of Louisville Hospital said two of 15 people who were brou

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