Protesters shout slogans and carry a banner through the corridors of a shopping centre in Lisbon June 27, 2013. Portuguese trade unions staged a one-day general strike on Thursday against relentless austerity which has deepened the worst economic slump since the 1970s, but support outside the public transport sector was patchy and the government seemed unlikely to back down. The words on the banner (in red) read: "general strike". [Photo/Agencies]