At least 17 people have been killed in different parts of northwest Nigeria\'s Gombe state after the presidential election, medical doctors said on Tuesday. \"We have at least 5 verified deaths and many more injuries, the chief medical director, Gombe State Specialist Hospital, James Mahadi told China\'s News Agency \"Xinhua\" reported. Also, the acting head at the Federal Medical Center in Gombe, Ali Misheliza said 12 persons have been confirmed dead, while 71 injured persons are still being taken care off. Violence has spread in northern Nigeria as youths protest the results of Saturday\'s presidential election being released state- by-state. Already, a 24-hour curfew has been imposed in Kano and Kaduna a densely populated cities in northwestern Nigeria, while a dusk-to- dawn curfew has been imposed in Bauchi and Katsina.