Protesters are calling for harsh sentences, as mining company executives go on trial over Turkey’s worst ever industrial accident. <br /><br /> Three-hundred-and-one workers were killed last May when an underground fire sent carbon monoxide through a mine in the town of Soma. <br /><br /> Hundreds of demonstrators have joined a march in Akhisar, in western Turkey. <br /><br /> “Words are not enough to express our pain. I have another son. He still works underground. He goes there everyday. And everyday, I go through the same pain. I wonder when the news will come to me,” said the relative of one victim. <br /><br /> Another added: “I want the (mine) inspector to be punished as well.”<br /><br /> Some of those who gathered were also angry that the defendants had not been brought to the court hearing. <br /><br /> “The culprits should be brought here. Why don’t they bring the defendants here? Let us see them, let us see how they defend themselves,” said one man. <br /><br /> After the disaster, mine operator Soma Holding said there had been no negligence.