Myrna Gonzalez, the mother of Miguel Oliveras, who was last seen in Portland in 2006, listens as the Portland Police Department holds news conference with the FBI on Tuesday to announce a reward of up to $10,000 for information. Derek Davis/Portland Press Herald

Portland police and the FBI’s Boston Division on Tuesday issued a $10,000 reward for information about a Boston man who has been missing for 18 years and was last seen in Portland.

Miguel Oliveras, a missing 24-year-old Boston man, with his mother, Myrna. Oliveras was last seen Sept. 2, 2006, in the parking lot of Platinum Plus in Portland. Provided photo

Miguel Oliveras was 24 when he went missing around 1 a.m. on Sept. 2, 2006, at the Platinum Plus Club on Riverside Street. He would now be 43 years old, according to the National Missing and Unidentified Persons System. There have been no reported sightings or contacts since his disappearance, despite “exhaustive investigative efforts,” the FBI said.

“Nothing has changed,” Myrna Gonzalez, Oliveras’ mother, said in a written statement. “More frustration, more anger, it has been a long time. I just want to find him and bring him home. I need people to come forward.”

Gonzalez and other family attended a news conference at Portland police headquarters on Middle Street Tuesday. She appeared somber standing beside police and declined to speak about the case.

Resident FBI Agent Christopher Peavey said investigators believe someone knows where Oliveras went after the club and hopes the reward will incentivize someone to come forward.

Portland Lt. Nicholas Goodman declined to speak further about the leads detectives have received, but said “positive gains” have been made to locate him. He said he hopes Oliveras is alive, but it is “logical” to believe that he may be deceased.

FBI Senior Agent Christopher Peavey speaks during a joint news conference with the Portland Police Department on Tuesday. Derek Davis/Portland Press Herald

Police have described Oliveras as a Hispanic man with brown eyes who stands approximately 5 feet, 11 inches tall. When he was last seen, Oliveras weighed 160 pounds and had black hair. He also had tattoos on his neck, back, shoulder and hand.

Anyone with information about Oliveras is asked to call 207-874-8575 or text “PPDME” and a message to 847411. They can also contact the FBI at 1-800-CALL-FBI or submit a tip online at tips.fbi.gov.