PORTLAND, Ore. -- Umpqua Bank and the Oregon Banker's Association are offering a reward of up to $10,000 for information leading to an arrest and conviction in a series of Eugene bank robberies.

The FBI says the same person is believed responsible for all three robberies at the Umpqua Bank on Donald Street in Eugene.

In all three robberies, the man walked up to the exterior drive-through teller window and demanded cash.

Each time, he said he had a bomb and left the bank on foot with an undisclosed amount of cash.

The man was described as white, in his 20s, about 5-foot-10 to 6-foot-2, about 180 pounds with dark hair and eyes.