Police have dubbed him the "Beastie Boys Bandit."

He wears a black wig, fake mustache, dark sunglasses and a dark-colored suit with a white, buttoned-up dress shirt to rob banks in the metropolitan Portland area.

Portland police said he's hit banks in Portland, West Linn and Lake Oswego

and March of this year.

Now, Portland police, in cooperation with Crime Stoppers, is seeking the public's help in identifying the serial bank robber who has been caught on surveillance camera tapes at multiple banks.

The suspect is described as in his mid 30s to 40s, about 170 to 200 pounds and 5 foot 10 inches to 6 feet tall.

In June, they say he robbed two U.S. Bank branches in East Portland. On June 3, he struck the U.S. Bank at 1225 S.E. Caesar Chavez Blvd., and on June 8, the U.S. Bank branch at 1901 N.E. 42nd Ave.

In each, he presented a demand note saying he was armed, or there was an explosive device in the bank. On June 3, he showed a handgun in his waistband.

Investigators also believe that the "Beastie Boys Bandit" is responsible for a July 2 robbery of the Bank of the West branch in West Linn; a Jan. 4 robbery of the Chase Bank in Lake Oswego; and a March 2 robbery of the Key Bank in Northwest Portland.

The Oregon Financial Institutions Security Taskforce (FIST) is offering a reward of up to $5,000 for information leading to the identification, arrest and conviction the suspect. FIST is a cooperative effort made up of representatives from banks, savings and loans, and credit unions, as well as representatives from local, state, and federal law enforcement agencies.

Crime Stoppers also is offering a cash reward of up to $1,000 for information, reported to Crime Stoppers, that leads to an arrest in this case, or any unsolved felony, and callers can remain anonymous. Call Crime Stoppers at 503-823-HELP (4357),

, or text 823HELP plus your tip and send it to CRIMES (274697).

The lead investigator in the case is Portland Det. Tony Christensen, at 503-552-5411.

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