Authorities said they are continuing to search Friday morning for a 27-year-old man who was reported missing after jumping off a boat to swim in the Magothy River in Anne Arundel County on the July 4 holiday.

About 6:30 p.m. Thursday, Nate Young of Annapolis was swimming with a group of friends but apparently got into trouble, according to Sgt. Brian K. Albert of the Maryland Natural Resources Police. No one was wearing a life jacket, Albert said. Young’s friends tried but couldn’t help him to safety because they were struggling to stay above water.

“They stopped [their boat] to cool off and jump in the river,” Albert said. “We are not sure if he just got tired, or he may have drifted away [from the boat] and was struggling to get back.”

Officials from the Maryland State Police Aviation, Anne Arundel County Fire Boat 19 and the U.S. Coast Guard searched for Young until dark Thursday and began searching again Friday at daybreak. Albert said officials will continue to search until nightfall.

Young is originally from Michigan and recently moved to Annapolis, officials said.

Albert said the incident is a reminder for people to wear life jackets when swimming in open water because “the currents and depth can change.”