BANGOR, Maine — Friends and family of a missing Bangor man who spent Monday searching the area on foot for him called off the search as the sun set for the evening.

“We’ll regroup tomorrow,” Becky Jo Cummings-Thompson, sister of Paul Francis III, said Monday night.

A search started Monday for Francis, 29, who has not been seen since he left work as a cook at Geaghan’s Pub on Thursday and went to a party on Sanford Street early Friday, officials and the man’s family are saying.

Francis, 29, who goes by the nickname “June Bug,” was last seen on Sanford Street between 1 and 2 a.m. Friday, Bangor police Sgt. Bob Bishop said Monday.

“Two detectives left this morning and are out canvassing” the area for Francis or for information about his whereabouts, Bishop said.

Cummings-Thompson and her son organized an informal search by friends and family who met at Second Street Park.

“We searched from Second Street to Sanford … Warren to Kenduskeag and the waterfront,” she said of the group.

Francis is described as 5 feet 6 inches tall and about 130 pounds with brown hair and eyes.

Many people have reposted a photo of Francis with calls for information about his status.

Brewer resident Jennifer Dorman, a volunteer from VK9 Scent Specific Search and Recovery, and her dog Sadie also have volunteered to help search for Francis.

“I’m meeting them over on Sanford Street. They’re going to bring something with his scent and we’re going to look around the area,” Dorman said Monday morning.

Members of the Down East Emergency Medicine Institute, a volunteer search and rescue group based in Orono, also will be lending a hand, Richard Bowie, DEEMI’s director of operations, said Monday.

“He went to a party on Sanford Street with friends and left there to head home to Center Street,” Bowie said of Francis’ last known whereabouts.

“Hopefully he turns up at a friend’s house,” Bishop said.

The missing man’s friends and family will not stop looking for him, Cummings-Thompson said.

“We will continue to do what is needed to find him,” she said. “Thank you to everyone who helped in searching for my brother. June Bug, we love you. Please come home.”

Anyone with information about Francis’ whereabouts can call Bangor police at 947-7382.