A V Australia Boeing 777-300, registration VH-VOZ performing flight VA-2 from Los Angeles,CA (USA) to Sydney,NS (Australia) with 305 passengers, rejected takeoff from Los Angeles' runway 25R at low speed after the crew heard a bang and thought they had a problem with a tyre on the nose gear. The airplane stopped after a roll distance of about 440 meters/1440 feet, the crew requested emergency services to check the runway for debris. The crew of another aircraft reported they had seen a spark off the nose gear, the crew of a third aircraft reported they had also seen a fire ball off engine #1 (GE90). The crew decided to hold on the runway and wait for emergency services to arrive and examine the aircraft. The aircraft taxied to the apron about 10 minutes later
It might be maint problem,lets wait for the report to follow