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BALTIMORE -- Baltimore police say they are back at square one after a daylong search of a state park failed to turn up clues in the disappearance of a North Carolina teenager.

Phylicia Barnes of Monroe, N.C., was reported missing Dec. 28, just weeks before her 17th birthday. She had been visiting three older half-siblings over the holidays in Baltimore when she went missing.

On Saturday, hundreds of law enforcement officers and volunteers searched Patapsco Valley State Park, a location that police spokesman Anthony Guglielmi says was identified through interviews with people of interest.

After three months, Guglielmi says investigators still have not gotten very far toward learning what happened to Barnes. And after Saturday's search he says police are very much back at square one.

What is frustrating to us is that there is someone out there, maybe more than one, who knows more than they've shared with us, Guglielmi told NewsChannel 36 in an interview via Skype. We know that, and we have no doubt in our minds that something terrible has happened to Phylicia.

Guglielmi said Baltimore police will continue talking to people of interest and make sure their statements are consistent.

I want to emphasize that we are very much committed to this case, he said.

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