Multnomah County prosecutors have charged two men with felony theft and computer crimes for allegedly using “skimmers” to steal debit card numbers at ATM machines.

Portland police said the pair compromised at least 300 debit cards and stole more than $10,000 from 10 different victims in March and April.

Thieves slip skimmers into an ATM and leave them there to read and copy information from cards used at the machine.

Police arrested Gabriel Tigmarau, 48, and Simion Ciprian, 36, after investigating skimming incidents at a Unitus Credit Union ATM, a Rivermark Community Bank cash machine, and at the IBEW Credit Union in Southeast Portland.

Police said surveillance video shows the two men skimming from the IBEW cash machine on six occasions in March and April.

When police approached Tigmarau, they allege he quickly walked into a Home Depot and discarded skimming equipment behind shelved lumber. Police said that when they arrested Ciprian in a vehicle they found skimming equipment, including a cigarette pack with “dozens” of prepaid gift cards inside.

Police said they were able to link the cards to stolen debit card numbers from more than 11 different financial institutions.

-- Mike Rogoway | twitter: @rogoway | 503-294-7699