Five robbers tied up the employees of a body shop on Amboy Avenue in Elizabeth, NJ, and stole about $250,000 worth of catalytic converters on April 18, 2014.
Officials said they have arrested four suspects, but are looking for one more, who is considered heavily armed.
The suspects fled the scene at Bayway Scrap Metals in two vehicles, a white U-Haul truck and a black 2001 Ford F-150 pickup truck.
At least one of the suspects in the U-Haul was caught after ditching the vehicle and fleeing on foot near routes 1 and 9. The Ford was found abandoned on Clarkson Avenue.