PORT-AU-PRINCE, Jan 26 (Reuters) - Haitian police officers on Thursday blocked streets and forced their way into the country's main airport to protest the recent killing of officers by armed gangs expanding their grip on the Caribbean nation. "PM is still at the Airport, unable to leave for now," said the source, who asked not to be identified. Haiti's National Police and the Prime Minister's Office did not immediately respond to requests for comment. Roads around Port-au-Prince and in several cities to the north were blocked by protesters. The proposal was originally made three months ago but no country has offered to lead such a force.

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