The Panama-registered Sanchi, run by Iran's top oil shipping operator NITC, collided with the CF Crystal, registered in Hong Kong, off the coast of China near Shanghai and the mouth of the Yangtze River Delta on Jan. 6.
The Sanchi sank on Jan.14 after burning for several days. The entire crew of 30 Iranians and two Bangladeshis, are presumed dead.
"(Representatives of) China and Hong Kong believe that both vessels were to blame," Iran's state TV quoted Nader Pasandeh, the country's representative on the investigating committee, as saying.
"But Iran, Panama and Bangladesh see the veering to the right by the Crystal as the cause of the disaster," he added.
Pasandeh did not say what the next step would be or how the conflict would be resolved.
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)