"During an interview with border guards at 1:46 a.m. [local time] a detained man blew himself up with unidentified explosive material. As a result of the explosion he died, and two border guards were injured," said Sergei Astakhov, adviser to the head of the Ukrainian border guards service.
The explosion took place on the Ukrainian side of the border near the village of Bachevsk, Astakhov said.
The man, who didn't have a Russian passport, was being questioned by the border guards, RIA Novosti reported. The man had been hiding along with four Moldovan citizens in a bus that was attempting to cross the border.