A homemade bomb exploded at an outdoor concert in Belarus' capital early Friday, injuring at least 50 people. Officials blamed hooligans. The blast took place in downtown Minsk at a concert marking the ex-Soviet nation's independence day. Minsk police spokesman Alexander Lastovsky said authorities had opened a criminal probe. Lastovsky said more than 20 people were hospitalized, but the Health Ministry put that number at more than 50. Most had leg wounds. Belarusian Emergency Situations Ministry spokesman Alexei Usatov said the bomb went off about 12:30 a.m. The concert was held at the Hero City memorial, which commemorates Minsk's suffering during World War II. Dmitry Kudyakov, a 32-year old engineer at the concert, said he felt a strong shock wave and saw smoke.