UNION CITY -- An armed robber and armored truck guards traded gun shots in the middle of Union City today.

Police say the gunman held up the armored truck outside the Bank of America branch on Londonderry Way just before noon.

The guard from AT Systems was not hurt, but police say the robber may have been injured.

Witnesses say the hold-up man got away with several bags from the armored truck, but dropped several as he ran from the scene.

There's no word yet on how much cash the suspect got away with.

Witnesses say the suspect got into a dark green Pontiac with the partial plate 6877. He did not appear to have an accomplice.

The FBI is investigating.