Four more victims of the May 15 bombing of a mosque at Gadan village, Gezawa Local Government Area of Kano State, died on Thursday, increasing the death toll to 21. Twenty-five early-morning worshippers were injured in the mosque bombing attack, one person died on the day of the incident and 20 others have died at the Muhammed Specialists Hospital, Kano, where they had been receiving treatment, leaving only four surviving. A 38-year-old man, Shafiú Abubakar, attacked the mosque with a locally-fabricated bomb on May 15. Governor Abba Yusuf of Kano State had ordered the prosecution of the bombin…