LIVERMORE -- Police have arrested two men on suspicion of robbing a pair of Livermore banks last month, police said.

The suspects -- Jeremy James Morton, 22, and Niem Siafu, 30 -- were not working together and the robberies were unrelated, Sgt. John Hurd said.

Morton, of Oakland, was arrested on suspicion of robbing Chase Bank at 1702 North Vasco Road on March 26, Hurd said.

Police said he used a note to threaten a teller while demanding cash and fled on foot after receiving the money.

Morton was arrested March 31 after being stopped by Sacramento County Sheriff's deputies on an unrelated traffic infraction, Hurd said.

Investigators took Morton into custody after matching his fingerprints to those of the Chase Bank robbery suspect, police said.

Siafu, of Fresno, was arrested April 4 on suspicion of robbing the Bank of Stockton on the same day in Tracy.

Detectives interviewed Siafu, who admitted that he robbed West America Bank at 1440 First St. in Livermore on March 22, said Hurd.

Witnesses told police that the robber was seen leaving the Livermore bank in a white Isuzu Rodeo, the same vehicle carrying Siafu when he was captured in Tracy about two weeks later, authorities said.

Tracy police have arrested a third man -- George Beesley, 41, of Martinez -- on suspicion of driving the Isuzu during the April 4 robbery, but investigators do not believe he was involved with the Livermore heists, Hurd said.

Contact Chris De Benedetti at 510-353-7011. Follow him at Twitter.com/cdebenedetti.