DNIPROPETROVSK, Ukraine -- Ukrainian authorities say they have no new leads in their investigation into the four explosions that rocked the eastern city of Dnipropetrovsk last week.
More than 30 people were injured in the explosions on April 27.
No one has taken responsibility for the attack.
Local authorities have begun their clean-up of heavy concrete garbage receptacles, where the explosive devices were placed.
Local officials told RFE/RL's Ukrainian Service that all the concrete receptacles would soon be replaced by light metallic trash bins.
Some 500 concrete receptacles have been removed so far.
It is not clear when the new metallic substitutes will be installed.