(CNN) -- A shaky truce crumbled in Kiev on Thursday morning, when gunfire erupted at Maidan, or Independence Square, which has been ground zero for anti-government protesters. At least 20 protesters died, said Oleg Musiy, head of the protesters' medical service. A policeman was also killed, the interior ministry said. It's unclear what prompted the gunfire. But CNN crews at the scene reported that as security forces were moving away from the area, a group of protesters pursued them, throwing rocks and Molotov cocktails. "Protesters broke the truce," said a statement from President Viktor Yanukovych's office. "The opposition used the negotiation period to buy time, to mobilize and get weapons to protesters." http://www.cnn.com/2014/02/20/world/europe/ukraine-protests/index.html?hpt=hp_t1

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