(NewsNation) — Authorities in Charlotte, North Carolina, said an investigation is ongoing into a shooting that killed four law enforcement officers and injured four others.

U.S. Marshal Thomas Weeks; North Carolina Department of Adult Correction officers Sam Poloche and Alden Elliot; and Charlotte-Mecklenburg Police Officer Joshua Eyer were shot and killed Monday while serving a warrant.

“We can never fully fill the void that they leave behind and we can never fully thank them for what they do to keep us safe, but today we can honor them and remember their lives,” Gov. Roy Cooper said Tuesday.

Weeks left behind a wife and four children, Poloche left behind a wife and two children and Elliot left behind a wife and one child. According to reports, Eyer died in the hospital with his wife and son by his side.

Authorities also provided an update on the four CMPD officers who were injured: Chris Tolley, Mike Giglio, Jack Blowers and Joshua Campbell. Three of the officers were treated for gunshot wounds, and Campbell was treated for a broken foot, according to Charlotte-Mecklenburg Police Chief Johnny Jennings. Tolley remains hospitalized in stable condition, but the other three have been released.

Jennings said the suspect, who was the subject of the warrant, was shot and killed, and as of now police do not believe there was another shooter. He said an investigation is ongoing and investigators are working to construct a timeline based on body camera footage and other evidence.

An AR-15 and a .40-caliber handgun were recovered from the scene, Jennings said, along with additional magazines and ammunition for both weapons.

Two women, one teen and one adult, who were in the house are cooperating fully with police but their identities and relationships to the suspect are not being released at this time.

Twelve CMPD officers fired their weapons during the shooting and have been placed on administrative leave during the investigation, as is standard practice for an officer-involved shooting.

Authorities also acknowledged the pain and loss for the law enforcement community in the wake of the shooting.

“It’s OK to not be OK,” said U.S. Marshals Service Director Ron Davis. “If you need help you can ask.”