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A second arrest has been made in connection with an incident at the Asda supermarket in Gravesend.
A 22-year-old man, from Erith, has been arrested on suspicion of robbery after a cash box was stolen from the supermarket on Thames Way.
He has been bailed until December 17.
Officers had been called to the store at about 12.30pm on November 6 following reports security guards had arrived to fill the ATM machine when a red Mini Cooper parked outside and two men wearing balaclavas got out and allegedly attacked the security guard.
They took the cash box before making off.
The vehicle was later recovered at nearby Kendal Gardens, while the cash box was found in Swanley.
The security guard suffered a bruised wrist as a result of the assault.
A 24-year-old man from Bexleyheath was arrested last week and is bailed until 17 December.