Authorities in Presque Isle, Maine, are investigating an officer-involved shooting that happened Saturday night.
Police say they received multiple calls about a suspicious person before 6 p.m., including one saying the suspect had a knife, appeared to be bleeding and was near the McDonald's on Main Street.
When Officer Lucas Hafford arrived at the scene and found the suspect, later identified as 29-year-old Derek J. Sam of Presque Isle, he asked him to drop the knife, police said.
When Sam didn't drop the knife, Hafford used his Taser to stop him from approaching him, according to police.
The Taser didn't stop Sam, and while still armed, continued to approach Officer Hafford, who then shot and wounded the suspect after several more tries to get him to drop the knife, police said.
Sam was taken to the Aroostook Medical Center for treatment and then flown via medial helicopter to Eastern Maine Medical Center.
The attorney general's office is investigating the shooting.