Be careful esp. when you are withdrawing $$$ from the bank. There just might be someone watching you and might distract you later on. Also, the banks in Manaus had the heaviest security I have ever seen in any bank. There are metal detectors at the bank, and you might have to unload your metallic items in a slot before you can enter the bank.
As always, keep your eye on your belongings, watch out for pickpockets, and walk tall.
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