Raleigh police: Bank robber getting 'more dangerous'

The Raleigh Police Department and the FBI is investigating at least six bank robberies since November in which they believe the same person is responsible.

In each case, the robber was described as a masked black man with a slender-to-medium build who is about 5-foot-8 to 5-foot-11 and has noticeably misshapen teeth and unusual eyebrows.

He also wore a dark blue sweatshirt with the company name "Chris' Detail" on the back or a black sweatshirt with the number 25 on the front in several of the robberies, police have said.

The latest robbery happened June 2 at a Wachovia Bank on Hillsborough Street in Raleigh. The same bank was also robbed on March 31.

Other banks in Cary and Raleigh were also robbed – SunTrust Bank at 910 Kildaire Farm Road in Cary on Nov. 25; Wachovia at 6623 Falls of Neuse Road in Raleigh on Dec. 29 and Jan. 21; and SunTrust at 3620 Six Forks Road in Raleigh on Feb. 26.

, the robber hit the teller in the head with his gun. In other robberies, he's assaulted bank employees, even though none resisted his demands.

"Why he decided to put hands on employees – we don't know at this time," Raleigh police detective Ben Huger said.

Detectives have said they want to find the suspect before his violent behavior escalates.

"He shows a firearm each time," Huger said. "He's very loud, very demanding, very controlling of the situation."

Amy Thoreson, a spokeswoman with the FBI, has said agents believe he might live outside Raleigh-Durham.

Anyone with information about the robberies or the robber, should contact Raleigh police at 919-996-3335 or the Charlotte Division of the FBI at 704-377-9200.

There is up to a $20,000 reward being offered for any information leading to an arrest.