• Supporters clashed near the final whistle at the London Stadium • Both clubs have promised to ban any involved for life The Football Association has launched an investigation into the crowd trouble that marred Wednesday night’s EFL tie between West Ham and Chelsea. Both clubs have also promised to ban for life any supporters found guilty of wrongdoing after trouble flared towards the end of the 2-1 victory for West Ham. “The FA is investigating crowd disturbances at last night’s EFL…