UAL1594, a Boeing 737-800, rejected takeoff at high speed on runway 15L after they blew a tire. AAL540, an Airbus A319-100, had already been cleared for takeoff on the same runway. Tower immediately cancelled their takeoff clearance and responded to UAL's request to roll the trucks. Sparks were seen coming from their undercarriage, they lost a hydraulic system, and hydraulic fluid was confirmed to be leaking by ARFF.
The Boeing was immobilized on the runway, a couple of news helicopters came in to cover to scene, and Tower switched to non-standard runway 15R departures. I retained some of the RT relating to all that for interest.http://avherald.com/h?article=49b036bf