Two more people, who were injured in a clash over establishing supremacy in Moshiali area of the city on Thursday, died at Khulna Medical College Hospital (KMCH) early Friday, taking the death toll to four.   The deceased were identified as Saiful Islam, 35 and Zihad, 30 of the area.   SM Shafiqul Islam, officer-in-charge of Khanjahan Ali Police Station, said Saiful and Zihad succumbed to their injuries at night.   Earlier, two people were shot dead and nine others were injured in a clash between two local groups over establishing supremacy in Moshiali area under Khanjahan Ali Police Station in Khulna on Thursday night.   Most of the injured sustained gunshot wounds while Zihad was beaten by his rival. All the victims were taken to KMCH for treatment.   Additional police have been deployed in the area to avert further trouble, said OC.