A total of 13 passengers have died while another 6 sustained critical wounds when their passenger coaster skidded off the track, slipping into a trench near Davelian in Muzaffarabad on early Saturday.According to police, the relief and rescue efforts have been kicked off, which police officials, area residents and some army soldiers are carrying out, private news channel reported.Eyewitnesses said 13 passengers have been confirmed dead whereas the death toll could mount further given the critical condition of wounded persons. A total of 22 passengers were onboard coaster, meaning a few might have gone missing. Injured persons are being shifted to hospital in Muzzafarabad located some 3 hours away from accident site, police officials confirmed. The reason of the accident could not be ascertained immediately, however, some reports confirmed for the mishap to have occurred due to over-speeding.