Ukraine released 67 people Sunday who were detained for    participating in violent clashes after pro-Russian protesters    stormed the police headquarters in Odessa, demanding they be    let go.  
    "Based on the decision taken by Odessa's regional prosecutor's    office and due to the demands of the protesters, 67 people    previously detained for participating in mass disturbances on    May 2nd in Odessa were released Sunday," said a statement on    the Ukrainian Interior Ministry's website.  
    The local prosecutor's office immediately denied it was    involved in the decision.  
    The choice to release the detainees, it said in a Sunday    statement, was made by police after officers failed to fulfill    their duties. The prosecutor's office said it has opened a    criminal investigation into their actions.  
    Earlier, hundreds of pro-Russian activists shouting, "Odessa is    a Russian city, one for all and all for one," attacked the    police headquarters, forcing open its gate and breaking windows    as they called for the release of their detained comrades. In a    tense scene filled with arguments -- but with no shots fired --    the separatists took down the Ukrainian flag and persuaded the    officers to release the detainees, according to a CNN team on    the ground.  
    The crowd cheered as the detainees left the police compound,    and many were embraced by friends and relatives.  
    Elsewhere in Odessa, hundreds of pro-Ukrainian supporters    marched to a trade union building where a fire had previously    broken out. They held a memorial there.  
    The protesters demanded an explanation for why the pro-Russian    detainees were released. A pro-Ukrainian demonstrator replaced    a Russian flag on the union building with a Ukrainian one.    There were no reports of violence.  
    Prime Minister visits Odessa after bloodshed  
    Earlier in the day, Ukrainian Prime Minister Arseniy Yatsenyuk    had visited the Black Sea port city, two days after a street    battle between Russian supporters and opponents ended in a    deadly blaze that killed more than 40 people.  
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Ukraine releases protesters in Odessa