BELGRADE -- Tens of thousands of Serbs joined an anti-government protest in Belgrade on Saturday, blaming a culture of violence for the deaths of 18 people in two mass shootings and calling on the interior minister to resign. The protest marked the one-month anniversary of the country's first school shooting on May 3, when a teenager killed ten in an elementary school. In the second shooting on May 4, a 21-year-old man killed eight in a town outside Belgrade. In response to the shootings, the government announced school summer holidays would start on June 6, two weeks earlier than planned. Opposition parties which organized the protest - the fifth in the ...Keep on reading: Tens of thousands gather in Serbia’s anti-government protest