Al Jazeera reports authorities have declared a 24-hour curfew in the Nigerian city of Kaduna after two blasts targeting opposition and Muslim leaders killed at least 44 people. The first explosion on Wednesday targeted a convoy of a prominent Muslim cleric Dahuru Bauchi, killing 25 people. A second blast hours later targeted opposition leader Muhammadu Buhari in a market area, killing at least 19 people. The Reuters news agency reported a death toll of 50 for the second blast, as witnesses also claimed a much higher figure than that provided by police. Buhari, the leader of the All Progressives Congress party, and Bauchi, a cleric who has publicly criticised the Nigerian armed group Boko Haram, were unhurt in the attacks. There was no immediate claim of responsibility, but Boko Haram has been staging attacks, especially with explosives, outside its northeastern heartlands in the past three months.