ORONO, Maine — Police, game wardens and volunteers searched the Penobscot River in Bangor on Sunday for a Maine Maritime Academy student who was last seen in Orono on Friday night, said Orono police Chief Josh Ewing.

Ewing said that aerial and ground searches were conducted to find David Breunig, 21, of Westbrook who disappeared after leaving a residence in the Crosby Street neighborhood around 11:30 p.m. Friday.

The Maine Warden Service and Down East Emergency Medicine Institute assisted in the search, Ewing said.

Dog tracking teams were brought in as well, Ewing said.

Down East Emergency Medicine Institute Operations Director Richard Bowie said Sunday that the Orono-based group has provided two Humvee teams to the effort, as well as additional personnel who were searching the banks of the Stillwater River and the area where the Stillwater meets the Penobscot River.

Bowie said that institute member Gary Soucy did some aerial imaging on Sunday from a Maine Forest Service helicopter that identified at least two objects of interest in the Penobscot River that triggered a search by boat and a ground search of the stretch of river that runs along the train tracks off Hancock Street in Bangor.

According to Ewing, police believe that Breunig last was seen in the area of North Main Avenue, between Hill and Pond streets.

Attempts to reach the missing student on his cellphone were not successful, Ewing said.

“His cellphone is either not working or has no battery [power remaining],” Ewing said.

The Hancock County Sheriff’s Office opened a missing person’s investigation on Breunig around 4:30 p.m. Saturday.

Breunig is described as 6-foot-4, with a slim, athletic build and weighs approximately 225 pounds. He has blue eyes and short, light brown hair. He was wearing a white shirt, dark blue jeans and brown Timberland boots when he was last seen, according to the statement from the Hancock County Sheriff’s Office.

“The Hancock County Sheriff’s Office is working closely with Maine Maritime Academy and in conjunction with the Orono Police Department and the Maine Warden Service in an attempt to locate Mr. Breunig,” the statement said.

In the meantime, Maine Maritime Academy is hoping for a good outcome.

Maine Maritime Academy President William Brennan reached out to the campus community in a Facebook post Sunday morning about what was known at that point about efforts to locate the missing student by the Hancock County Sheriff’s Office and Orono police.

“We hold hope for David’s safety. Additional information will be provided as it becomes available,” Brennan said.

The search is set to resume early Monday morning.

Anyone with information about Breunig’s whereabouts can contact Lt. Christopher Thornton of the Hancock County Sheriff’s Office at 667-7575 or the Orono Police Department through the Penobscot County Regional Communications Center at 945-4636.

BDN writer Bill Trotter contributed to this report.