13 of 37: Slovenian troops serving in the NATO-led peacekeeping mission in Kosovo set up a checkpoint on the bridge in the ethnically divided town of Mitrovica on Thursday, July 28, 2011. A mob of about 200 Serbs hurled firebombs and set ablaze a customs post on Kosovo's northernmost border with Serbia on Wednesday, hours after Kosovo's special police withdrew from the area. NATO responded by sending hundreds of troops in an attempt to quell the violence and came under fire as it did so, NATO spokesman, Cpt. Hans Wichter told The Associated Press. (AP Photo/Visar Kryeziu) (AP Photo/ Visar Kryeziu)

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