A Baltimore man charged in a string of area bank robberies was linked to the crimes through a fingerprint on a note he handed a teller in an Anne Arundel County robbery, the FBI says in court documents. 

Tony Derrell Bunch, 31, was arrested by the FBI's Safe Streets task force on April 15. The agency has said that it believed Bunch was involved in as many as seven bank robberies in the region.

In a document unsealed Monday in U.S. District Court, officials said they were working to identify the robber when Anne Arundel County Police contacted them about a note left at the scene of an April 4 robbery at a Bay Bank.

County officials said their crime laboratory had matched the fingerprints to Bunch, and authorities then matched his picture to surveillance images, the records show.

The documents also provide new information about the robberies - in a robbery in Essex that netted more than $3,700, authorities say the suspect fled on an orange bicycle. The documents also show that the robber threatened to shoot people at the banks if the tellers did not comply or if they handed him dye packs.

Bunch is charged with bank robbery and is being held in federal custody. No attorney was listed in court records. Bunch was previously convicted of a sex offense charge in 1999 and sentenced to nine years in prison.