Bomb threats were received by 78 Serbian elementary schools and 37 high schools on May 17, the Education Ministry said in a statement, as the Balkan country was still reeling after two mass shootings in and around Belgrade on May 3-4 in which 18 people were killed and 20 others were wounded. Students were evacuated and classes were canceled, the ministry said, but so far no explosive devices were found in any of the schools checked by police. A gun amnesty declared after the mass shootings resulted in some 13,500 mostly unregistered guns, but also rocket launchers and grenades, being turned in. To read the original story by RFE/RL's Balkan Service, click here.