A321
Air Traffic Control Fully Certified
ATC Issue All Types; Conflict Ground Conflict; Critical; Ground Incursion Runway
Air Traffic Control Issued Advisory / Alert; Flight Crew Rejected Takeoff; Flight Crew Took Evasive Action
Human Factors
I was working LCE (Local East); as a coordinator. I heard LCW (Local West) clear Aircraft X for takeoff. Right after that; I observed Aircraft Y starting to cross [the] runway. I pointed it out to LCW and told them to have Aircraft X abort their takeoff.
Taxied to XXR for departure due to weight. Cleared to line up and wait. After about 2 minutes in position cleared for takeoff. After setting takeoff power and cross checking instruments I noticed an aircraft taxiing southbound [toward the runway]. It didn't appear that the aircraft was going to hold short of our runway. Approaching 80 knots I decided to abort the takeoff. The First Officer also noticed the aircraft and brought this to my attention as we were aborting. About this time ATC told the other aircraft to stop. We managed to stop the aircraft before the taxiway. The other aircraft had passed the hold short bars and was on the runway. Cleared the runway and made a PA to the passengers. Called Dispatch with Maintenance on the line to make sure we didn't need to return to the gate since we were below 80 knots. After running the before takeoff checklist again we departed.
Tower Coordinator and an A321 flight crew reported a rejected takeoff due to a runway incursion.