Initial reports suggested that 9 passengers had died in the accident, while 6 were admitted to the Serchhip Hospital in a critical condition police said.
Later 2 Passengers died because of their injuries, rising the death toll to 11, they added.
The remaining injured passengers are undergoing treatment at the Pangzawl Primary Health Centre and Haahthial Community Health Centre they said. Majority of the victims are from Siaha district, police said.
The bodies of the deceased would be sent to their respective villages for the funeral after postmortem examination a police officer said.