Receive Breaking News updates as they occur
By Amy Sawitta Lefevre BANGKOK (Reuters) - Anti-government protesters in Thailand pinned their hopes on winning support from the powerful security forces on Thursday to take forward a campaign to oust Prime Minister Yingluck Shinawatra and install an unelected administration. Protest leader Suthep Thaugsuban, a firebrand veteran politician, has asked police and military chiefs to meet him by Thursday evening and choose their side in the latest crisis engulfing Southeast Asia's second-biggest economy. The politically powerful army has staged or attempted 18 coups in the past 80 years - including the ousting of Yingluck's brother, Thaksin Shinawatra, in 2006 - but it has said it does not want to get involved this time, although it may mediate. His opponents are Thailand's royalist elite and establishment who feel threatened by his rise.