UPDATED 6/14, 8:30 a.m.

A number of Portland-area residents reported their debit cards either were compromised or canceled suddenly over the weekend, and Beaverton police said at least one case was related to a data breach earlier this year at Michaels Stores Inc.

Bill Johnson, a customer at First Tech Federal Credit Union, discovered $800 in unauthorized ATM withdrawals on Saturday, while a spokesperson at Advantis Credit Union said it saw a spike in debit card fraud over the weekend. Several U.S. Bank customers reported their debit cards were canceled without notice.

Beaverton Police Department spokeswoman Pam Yazzolino said it referred one case to the U.S. Secret Service, which is investigating the Michaels breach.

Michaels reported last month that Personal Identification Numbers pads at close to 90 stores had been tampered with between Feb. 8 and May 6, exposing payment cards to possible fraud. The tamperings occurred at two stores in Beaverton as well as stores in Tualatin, Roseburg, Springfield and Medford, the company has said.

Some PIN numbers have been used fraudulently since then, company officials said. But in Beaverton, illegal charges using those PINs might be just beginning to show up, Yazzolino said.

Doug Marker, vice president for loss prevention and safety at Michaels, said today via a spokesperson that “it cannot be assumed that all fraud experienced by any Michaels shopper is necessarily connected to Michaels.” Regardless, he said, victims should work directly with their bank and card issuer to protect their account.

UPDATE: Unitus Community Credit Union vice president Laurie Kresl said via e-mail Tuesday the institution has seen an increase in attempted fraud recently believed to be related to a national merchant. The credit union also is aware of "a smaller issue" apparently related to a compromise at a local merchant. She did not name the merchants.

Johnson of Beaverton said he discovered ATM withdrawals in Las Vegas and Los Angeles within minutes of each other. He reported the unauthorized transactions in person to First Tech Federal Credit Union. Johnson's wife frequently shops at one Michaels in Beaverton.

Johnson said he learned of other victims while at First Tech and after posting about his experience on Twitter and Facebook. First Tech credited Johnson's accounts today, he said.

Customers who shopped at affected Michaels Stores should monitor their accounts closely for possible fraud, the company has said.

– Brent Hunsberger and Rebecca Woolington