A second bombing in Gombe city Thursday, in a market crowded with customers doing some last-minute shopping for the Eid festival marking the end of the Ramadan killed about 50 people and dozens were injured. The upsurge in attacks followed a directive to create more mayhem during Ramadan from the Islamic State group, to which Boko Haram has sworn allegiance. The violence intensified after Nigeria’s new president, Muhammadu Buhari, a former army general, took power a month and a half ago and vowed to crush the group. This week, Buhari replaced all of Nigeria’s military chiefs. He will meet U.S. President Barack Obama for talks in Washington on Monday. Boko Haram insurgency has killed more than 15,000 people in Nigeria since 2009.