Islamabad: Four terrorists including Afghan Kharji Ubaidullah Saad have been killed during a successful intelligence-based operation by security forces in Kurram.According to Radio Pakistan, the slain Kharji Ubaidullah Saad was a resident of Shah Qila village in Afghanistan's Logar province and was affiliated with the proscribed Fitna al-Khawarij. Ubaidullah Saad was involved in multiple terrorist activities in Pakistan.