AP

KIEV PRESIDENT Viktor Yanukovych says investigators have not yet determined who was responsible for four explosions in an eastern Ukrainian city and are offering a 2 million hryvna ($250,000) reward for information leading to an arrest.

A total of 27 people were injured Frday when bombs blew up in garbage bins in Dnipropetrovsk.

Many Ukrainian officials have called the blasts terrorist attacks.

The opposition, however, claims they could be part of a government plot to divert attention from the imprisonment of opposition leader Yulia Tymoshenko.

Top law enforcement officials rushed to Dnipropetrovsk to investigate and Yanukovych joined them in the city on Saturday. He says the investigators had made some progress in reducing the number of possible scenarios.