A new bank has come to Washington, and authorities say a man took a novel approach as he tried to rob it: He wore a hat marked “FBI.”

The old Wachovia bank branches in the District were renamed Wells Fargo last month. And according to a D.C. police account, one man, wearing a different hat each time, has robbed one branch and tried to rob another.

The robbery occurred about 3:45 p.m. Sept. 30, in the 1800 block of Adams Mill Road NW in the Adams Morgan area. Police said the robber gave a teller a note declaring a holdup and demanding money.

The robber showed a handgun, got cash and left, police said.

One week later, police said, the same man showed up about 4 p.m. at a Wells Fargo branch in the 1100 block of Connecticut Avenue NW. He again passed a note demanding money, police said. But no gun was reported, and police said he left empty-handed.

On the first occasion, police said, the man wore a black hat with a blue-and-red logo. The next time, they said, he wore a dark hat that read “FBI.”

It was not clear where the man got the hat or why he chose to wear it.