Police Lt. Thomas Welch says a fight broke out in the street Wednesday before the groups got in vehicles and a chase ensued.
Welch says officers pulled over both vehicles and arrested four people, including the original two robbers, ages 40 and 31, and two men from the second group, of ages 22 and 27. All four are from Illinois.
But he says police didn't recover any cash or jewelry and are searching for more suspects.
No estimate was available of the value of the stolen items.
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