Authorities are investigating an armed bank robbery that took place recently in Northern Virginia.

On May 18 at about 10:30 a.m., a man entered the Carter Bank and Trust at 8402 Sudley Road in Manassas, approached the customer service desk, asked to use the bank's bathroom and left, according to the FBI.

But 20 to 30 minutes later, the robber reentered the bank carrying a black pistol and a plastic shopping bag. He pointed a gun at the teller and ordered the employee to give him money. The robber then put money in the bag and exited the bank, authorities said.

A vehicle was seen leaving the scene, but authorities are not sure whether the robber was inside it, FBI spokeswoman Lindsay Godwin said. No one was injured during the incident.

The FBI is not connecting this bank robbery to any others in the area, Godwin said.

The robber, seen in grainy surveillance images, is described as a black male who is 6 foot to 6 feet 3 inches tall. He was last seen wearing a dark blue baseball cap, a zip-up hoodie, a dark T-shirt and gray washed jeans.

Anyone with information can call Prince William County Crime Solvers at 703-670-3700 or 866-411-TIPS (8477). People can also call the FBI at 202-278-2000.