Afghan officials say at least 13 people have been killed and some 30 others wounded in an explosion at a mosque in eastern Khost Province that was being used as a voter registration center. Talib Mangal, a provincial government spokesman, said that an explosive device placed inside the Yaqoubi mosque detonated at around 2.30 p.m. local time on May 6 and caused casualties among civilians who had gathered both for prayers and to register to vote. Abdul Wali Wahidzai, a provincial council member, said the number of casualties might rise. No one immediately claimed responsibility, but the extremist group Islamic State (IS) has carried out similar attacks in the past. Taliban militants have also warned people not to take part in the elections. There have been a number of attacks on voter registration centers since the process began last month. At Least 13 Killed, 30 Injured In Mosque Blast In Eastern Afghanistan That's why you don't make deals with terrorist groups. It doesn't change.