Spokeswoman for the Prosecutor General of Ukraine Larysa Sarhan wrote on Facebook, Censor.NET reports.
"One of the detainees already started cooperating with the investigation giving important testimonies against the leader of one of the groups involved in riots," she wrote.
"Moreover, a member of the Socialist Party Ivan Stupak has already been questioned as a witness. Investigators now have seven suspects in custody. The investigators of the prosecutor's office are making efforts to establish masterminds of the riots," the spokesperson said.
As reported, on May 9, clashes occurred near the Monument of Glory in Dnipro. After pro-Ukrainian activists demanded to remove political and proscribed insignia - St. George ribbons, communist flags, etc. - a group of young people, who came to the monument together with Opposition Bloc MP Oleksandr Vilkul, attacked the activists and ATO soldiers. Eight paid protesters were detained on charges of May 9 clashes; they have been subsequently released.