SAN MATEO (Map, News) - An unarmed man robbed a bank in Millbrae on Wednesday, the second such occurrence in the city within three days, police said.

A man dressed in black with a black bag robbed a Comerica Bank on 49 El Camino Real at 4:15 p.m., Sgt. John Aronis said. The man walked up to the teller, presented a demand note and walked out of the bank with an undisclosed amount of money, he said.

Witnesses did not see a weapon and the man did not have his face covered, and the bank had security cameras, Aronis said. Witnesses saw the man, described as white and in his mid- to late-20s, hop a rail by the bank and possibly head west on Chadbourne Avenue toward Magnolia Avenue, he said.