An explosion on the Metra train tracks on Saturday, Nov. 3, 2018, near the Grayland station has killed one worker and badly injured another.

Two welders were working in the 4500 block of West Byron Street when the tragedy occurred, according to officials. The two men were taken to Advocate Illinois Masonic Medical Center where one tragically died. There were reportedly 17 workers in the area repairing the tracks. The Federal Railroad Administration (FRA) is investigating the cause of the explosion.

The incident occurred about 11:45 a.m. on elevated tracks about seven miles from downtown Chicago. The cause of the explosion is not yet known. Nearby neighbors reported to the Chicago Tribune that they heard a loud boom that shook their house.