BOSTON -- Police are looking for two men who robbed a bank in Braintree on Thursday.

Two men, dressed all in black and wearing masks and armed with black handguns entered the Sovereign Bank on Rockdale Street shortly after 11 a.m., Braintree police said.

A teller saw the two men walking up the stairs to the bank and warned her co-workers to get down, police said.

The two masked men told everyone, including several customers, to get on the floor. One of the men then ordered the assistant bank manager to open a door behind the tellers' counter, police said.

The man then grabbed an undisclosed sum of money from each of the tellers' stations as the other man watched the employees and customers, police said.

The men then fled in a minivan that was later found a short distance away in an office building parking lot in Quincy. The van was reported stolen in Dedham the night before and was being processed for fingerprints and other evidence.

Anyone with information should contact the Braintree police at 781-794-8620 or the FBI at 617-742-5533.