Armed police officers arrived in Chandler's Ford in the early hours of the morning of 13 September and concealed themselves in a public toilet close to the bank, supported by snipers in overlooking buildings. At 10:05, shortly after the arrival of the G4S van, Mark Nunes (wearing a mask) approached the guard and pointed a gun at him, demanding he hand over the cash box. A police sniper opened fire, hitting Nunes in the chest. As officers were deploying from their hiding place, a second gang member, Andrew Markland, ran over and picked up Nunes's weapon; he was shot twice by a second sniper. Police officers attempted first aid but Markland died at the scene. Nunes was airlifted to hospital but died later that day.
