The robbery happened around 9:45 a.m.
According to police, two men armed with assault rifles robbed a Brinks truck, and sources say the men fled in a blue getaway car.
Police believe they have located the getaway vehicle in Philadelphia. A blue Acura SUV was towed from the scene.
WPVI learned that the truck was servicing a Budget Financial Center at the time of the robbery.
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WPVI's helicopter was over the scene, where the truck was seen pulled over on the side of the road.
No one was injured and no one is in custody.
The area is a busy business district. Police are talking with witnesses at the scene.
"We can see from our point of view was arguments and the car just took off on the sidewalk. That's what I saw," one witness said. "And then, of course, when the cops came, that's when they said we need to see the cameras. The store got robbed at gunpoint."
The FBI is now leading this investigation, sources said.