Members of the Communist-affiliated PAME trade union are seen blocking the entrance to the Athens Exchange yesterday to protest the government’s austerity measures. Trading on the Athens bourse continued as normal. Bourse officials said a backup mechanism enabled electronic trade to proceed as normal. The exchange operates through remote electronic trading and does not have a physical trading floor, although some staff need to report to work to keep systems running. There were no reports of arrests. The blockade, created by around 150 workers, occurred ahead of today’s 24-hour general strike called by the country’s main unions, which is set to halt public services and ground flights, adding to the disruption of airline travel in Europe caused by walkouts elsewhere.