Halifax Regional Police have arrested a 66-year-old who they say robbed the RBC Royal Bank at the corner of Spring Garden Road and Summer Street on Monday.
Police arrested the man after receiving a tip that he was walking in the 6100 block of Almon Street. He is being questioned.
Charges have not been laid.
Officers say a man went into the bank at around noon on Monday, said he had a weapon and demanded money. He left the bank with an undisclosed amount of cash.
No one was injured during the robbery.