A crew of heavily armed men robbed the Navy Federal Credit Union at 875 N. Randolph Street in Ballston Saturday morning, in a heist reminiscent of a Hollywood movie.

Three men who were wearing ski masks and pointing guns entered the credit union, located a block from Ballston Common Mall, just before 10:00 a.m. on Saturday, according to Arlington County Police spokesman Dustin Sternbeck.

They shouted threats and forced the 13 customers in the business to lie on the ground. The men made off with several bags full of cash — an undisclosed but substantial sum of money — and were whisked from the scene of the crime by a getaway driver who was waiting outside, Sternbeck told ARLnow.com.

The suspects threw the bags (minus the cash) out of the car window as they made their escape to D.C. via I-66, Sternbeck said, but they were apparently unaware that the cash contained a GPS transceiver. Metropolitan Police used the GPS signal to track the cash to a residence in Southeast D.C., where all four men were arrested.

The FBI is investigating and the men may face federal charges, Sternbeck said.