DERA ISMAIL KHAN: At least four people including lawyers and a teacher were killed in separate incidents of firing here. Police said that unidentified motorcyclists sprayed bullets at two lawyers killing them on the spot near Shamoon Chowk in Dera Ismail Khan. The assailants sped the scene after committing dual murder. Meanwhile, in yet another incident of firing near Mariali More two people including a teacher were killed in firing of unidentified miscreants. Police said that both incidents seem to be the outcome of personal enmities, however, separate cases in both incidents have been registered at the respective police station have started the investigation.