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By Anthony Boadle BRASILIA (Reuters) - Environmentalist Marina Silva officially launched a bid for president on Wednesday, upending Brazil's October elections and threatening the ruling Workers' Party's 12-year hold on power. Silva, until now a vice-presidential candidate for the Brazilian Socialist Party, accepted its nomination to top the ticket after candidate Eduardo Campos, a former governor and rising political star, was killed in a plane crash last week. Silva pledged to build a more prosperous Brazil and slammed the performance of incumbent President Dilma Rousseff, who has overseen four years of lackluster growth and high inflation in a previously booming economy. Silva reaffirmed her commitment to fiscal responsibility, inflation targeting and a floating exchange rate, the so-called "tripod" of economic policies that gave Brazil stability after a period of rampant inflation and erratic growth in the 1990s.
US forces tried but failed to rescue reporter James Foley and other US hostages held in Syria by the Islamic State (IS), officials and reports said a day after the militants released a video showing the journalist's beheading. The Pentagon and the White House did not say if the covert mission earlier this summer was to rescue Foley, who was kidnapped in northern Syria in November 2012 and whose murder has provoked revulsion and condemnation. The video of Foley's killing also showed a second US reporter, Steven Sotloff, being paraded by a black-clad IS militant who warned that he would also be killed if US President Barack Obama does not stop air strikes on IS positions in Iraq.