Detectives are investigating two bank robberies this month at branches of the same bank in San Dimas and Diamond Bar.

The suspect descriptions and tactics bore similarities, however authorities would not say Thursday if the robberies were believed to be connected.

The most recent robbery was reported just after noon Monday at the California Bank & Trust, 530 W. Bonita Avenue in San Dimas, Los Angeles County sheriff’s Sgt. Kirk Smith said.

The suspects, who were initially described only as two men wearing bandanas over their faces, demanded cash before fleeing from the bank and heading west on Bonita Avenue, the sergeant said. They brandished at least one handgun.

Another California Bank & Trust branch, this one at 1200 S. Diamond Bar Blvd. in Diamond Bar, was also robbed by two men just fter 3 p.m. on May 16, Sgt. Cruz Solis said.

One of the robbers was a black man with a light complexion, about 6 feet tall, wearing a tan baseball cap, Solis said. The second robber was described only as about 5 feet 10 inches tall and wearing dark clothing.

A surveillance camera image taken during the robbery and released by the FBI shows one of the robbers wearing a long-sleeve blue shirt, white pants, a black cap and a red bandana over his face.

The robbers in the Diamond Bar caper were last seen fleeing south on Grand Avenue in a silver Nissan pickup truck.