DONETSK, Ukraine (Reuters) – A loud blast was heard early on Wednesday in the center of the city of Donetsk, which is held by Russian-backed separatists in eastern Ukraine, a Reuters witness said.
The origin of the blast was unclear.
(Reporting by Polina Nikolskaya in Donetsk and Polina Devitt in Moscow; writing by David Ljunggren; editing by Jonathan Oatis)