Nobody was hurt in the incident.
As referee Liu Kwok Man, of Hong Kong, spoke to one of his assistants about the situation, Sepahan player Adel Kolahkaj picked up a small object and threw it towards a corner flag.
There was shock all round as the object exploded before smoke began to stream out.While the Sepahan players went for a closer inspection, the shocked match officials sprinted for the safety of the halfway line.
Play resumed after a break in proceedings and the game finished in a goalless draw. ---
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