An American teenager disappeared during a cruise in Germany, police said.

Aydin Brown, 14, was last seen at 7 a.m. Thursday when he left the Caribbean Princess in Rostock-Warnemünde, a port town on the Baltic Sea, police said.

He is about 5-7, has long dark hair and was last seen wearing a dark jacket, dark pants and retro shoes, police said.

Princess Cruises said in a statement Friday that it is actively working with German police in the search for the teenager.

The boy left the vessel without an escort, the statement said.

“We understand the distress this situation has caused and will continue to provide ongoing on-site support to the family during this challenging time,” Princess Cruises said.

The teen’s grandmother, whom Brown was traveling with, left the ship Thursday night and is being helped by company employees in Warnemünde. Princess Cruises also arranged for his mother to fly to Germany as the search continues, the cruise line said.

“We greatly appreciate the swift response and ongoing efforts of the local authorities in their search for the young man,” the statement said. “Their dedication and expertise are invaluable in this critical situation, and we are doing everything we can to assist them.”

Police are also searching for a witness who may have seen the teen about 7:30 a.m. Thursday at the train station in Warnemünde.

The witness is described by police as between 20 and 25 years old. and has been asked to urgently report to the criminal investigation department in Rostock.

Natasha Worthington, who is traveling on the cruise said that despite the teen’s disappearance, “The mood on the ship is still upbeat as not a lot of people are talking about it.”

She said she has little information about the situation, adding “we would like to know what’s happened as we feel extremely sorry for the family.”