PORTLAND, Maine (AP) — Mercy Hospital is offering a $20,000 reward for information leading to the arrest and indictment of those responsible for the fatal shooting of a security guard.

CEO Eileen Skinner says one of the hospital’s core values is justice, and she wants justice following the death of James Angelo Okot. The unarmed guard was on break early Sunday in a hospital parking lot when he was gunned down after being approached by two people.

Police Chief Joseph Loughlin said Thursday that witnesses and video surveillance captured the two assailants running away. He says detectives have some strong leads in the case, but he declined to get into details at a news conference.