An inquest into the death of a Reuters video journalist shot during a Thai military crackdown on protesters in 2010 has ended inconclusively, with a court saying it cannot determine if soldiers or protesters fired the fatal shot.

The Bangkok South Criminal Court announced the results of the inquest Thursday — five years after Japanese cameraman Hiroyuki Muramoto was killed while covering bloody clashes on April 10, 2010.

The court said "it was not known who committed the action" since it could not determine the type of weapon or bullet used.

Thailand has been criticized for the slow pace of investigations into more than 90 deaths that took place during mass protests in 2010.

Previous inquests have blamed some deaths on Thai soldiers but no soldiers have been held accountable.