The story

Federal investigators are looking overseas for clues and suspects in a scam that uses bomb threats to extort money from banks and stores, law enforcement officials told CNN.

For the past week, banks and stores in at least 13 states have been hit by the scam, in which a caller claims there is a bomb on the premises that can be detonated if employees don't meet a demand to wire money to a specific account.

In one incident in Kansas, the caller ordered store employees and customers to take off their clothes, police said. Read full article »

CNN's Carol Cratty, Jeanne Meserve and Katy Byron contributed to this report.

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