Thousands of Dell laptop computers worth as much as $4 million were stolen in an armed robbery at a warehouse in the Harbor Gateway area, police said Monday.

The thefts occurred about 11:30 a.m. Friday at a warehouse in the 19200 block of South Western Avenue, Los Angeles Police Department Officer Mike Lopez said.

Five male suspects, four of whom were masked, were involved in the heist, during which a security guard was held at gunpoint, Lopez said.

The guard at the warehouse was zip-tied and the bandits drove two trucks onto the property, hooked up two trailers containing a more than 7,600 laptops and drove off, police said.

One of the trailers was found empty Saturday morning in Commerce, LAPD Capt Gary Walters told ABC7.

The crime was being investigated by the Auto Theft Section of the LAPD’s Commercial Crimes Division, Lopez said.

Anyone with information on the thefts that could help detectives was urged to call (818) 832-7510.