MINSK, Belarus, July 4 (UPI) -- An unexploded bomb has been found in the Belarusian capital of Minsk near the site of this week's concert bombing, the interior minster said Friday.

Interior Minster Vladimir Naumov said fingerprints were found on the second bomb, giving investigators hope they may be able to learn the identities of those responsible for Thursday's bombing, RIA Novosti said.

Nearly 50 people were injured, none seriously a police source said, when a bomb exploded at an open-air Belarusian Independence Day concert in Minsk.

Police said the incident near the Hero City Minsk Stele was likely caused by hooligans, but all possible theories would be considered.

"At present the scene has been cordoned off and an investigation team is working at the scene," police said. "We are considering a number of versions, of which hooliganism is the most probable."

Interior Ministry officials told RIA Novosti that festive events in Minsk would continue despite the explosion and discovery of a second bomb.