A suicide bomber killed at least eight people on Monday near Muslim clerics leaving a giant tent in the Afghan capital, where they had gathered to denounce terrorism and call for peace, according to security officials. No group immediately claimed responsibility for the attack. A series of bombings in Kabul has killed dozens of people in recent months, and has shown no sign of easing during the Muslim holy month of Ramadan, Reuters reports. Islamic State (IS, formerly ISIS) has claimed many attacks in Kabul but security officials say several are much more likely to be the work of the Haqqani network. The group is affiliated with the Taliban, who are seeking to re-impose strict Islamic rule after their 2001 ouster by US-backed forces.