The OSCE Special Monitoring Mission (OSCE SMM) to Ukraine is verifying reports of the shelling of School No. 63 in Donetsk, where two teenagers were killed and four more were injured at a sports ground on Wednesday.

"OSCE SMM is aware of reports of shelling of school in Donetsk involving children casualties. OSCE SMM is verifying this information," the mission reported on its page on Twitter on Thursday.