The FBI said the suspects have been involved in at least six robberies at BMO Harris banks in the south and west suburbs since June.
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Those with more information can earn up to a $20,000 if that information leads to an arrest.
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The BMO Harris in Woodridge was the latest target. Two "bundled bandits" went to the front door at 9:53 a.m. on Friday. Investigators believe the suspects shattered the locked door, but they fled and did not enter the bank.
The FBI described one suspect as being over 6-feet tall with a slim build, approximately 160 pounds. He or she was wearing a black hoodie with the hood up, a black mask, dark pants and was armed with a semi-automatic handgun.
FBI described the other suspect as wearing a dark hoodie, a green reflective construction vest and a mask.
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Tips can be reported, even anonymously, to tips.fbi.gov or by calling 1-800-CALL-FBI.
Bank robbery attempt locations and times:
BMO Matteson on June 10, 2023
BMO Frankfort on June 17, 2023
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BMO Bolingbrook on July 1, 2023
BMO Naperville on July 19, 2023
BMO Addison on July 21, 2023
BMO Woodridge July 28, 2023