Napa police Monday were continuing their investigation into Friday's Umpqua Bank robbery involving an armed man they suspect robbed the same branch in late October.

They've released photos of the robber, hoping to spark information in the case to help identify the man.

The robber struck just before 1 p.m. Friday at the bank on Brown's Valley Road, said a Napa police official.

On Friday he was dressed in black, from his beanie hat to his long-sleeved black shirts and pants. He also wore dark sunglasses and carried black-colored accessories -#8212; a duffel bag and a handgun.

Holding the gun and bag as he walked into the bank, the man approached a teller and demanded money.

The cash was stuffed into the duffel and he left, last seen walking south through the Moose Lodge parking lot, said police.

An extensive search of the area included a police dog, a CHP helicopter and police and Napa County sheriff's deputies.

They didn't find him.

Detectives believe the same man robbed the bank on Oct. 29. A bank surveillance photo of that day's robber showed a man in a white shirt and grey beanie, also wearing sunglasses.

Officials asked anyone with information to contact Detective Todd Shulman at (707) 257-9575 or