MOSCOW, 16 Sep. Nine people were killed and 23 injured in a Nigerian air force strike in northeastern Nigeria, the local emergency department said on Thursday. The incident in question took place Wednesday in the Nigerian state of Yobe, local newspaper Punch said. Local residents previously told the newspaper that as a result of the shelling from a fighter jet of the country's Air Force, nine people were killed, several more were injured. Initially, the Nigerian Air Force issued a denial of this information, but on Thursday admitted that civilians could be killed and injured during the anti-terrorist operation. An investigation of the incident will be conducted. In Nigeria, 240 prisoners escaped after an armed attack on a prison «Twenty-three injured people (five children, ten men and eight women) have been hospitalized and are currently receiving free treatment at a public hospital,» the Emergency Management Agency said in a Facebook post. Yobe State. «Unfortunately, nine people died,» the agency added. According to the Nigerian Air Force, the fighter was sent on Wednesday to respond to «suspected terrorist activities in the area along the Nigeria-Niger border.» It was noted that this happened after receiving intelligence on the movements of Boko Haram * militants and the Islamic State West African Province * (ISWAP *, banned in the Russian Federation) terrorist group. The Nigerian Boko Haram * terrorist group has been known since 2002. In March 2015, Boko Haram * swore allegiance to the Islamic State * (IS *, banned in Russia) and changed its name to Islamic State West African Province * (ISWAP *). Later, a split occurred in the group, and now Boko Haram * and ISWAP * are two separate groups. * Terrorist organizations banned in Russia Media: in Nigeria, more than a hundred students and teachers were kidnapped from school