Thousands of people in Istanbul have been protesting against the deadly mine disaster on Wednesday.
Many gathered in Taksim Square, the scene of last summer’s rallies, chanting for the government to resign.
The four main unions have called for a national strike on Thursday.
They say the explosion which left more than 270 dead was not an accident but a crime or a “work murder”.
In Turkey’s capital Ankara, around 800 students protested.
Police fired tear gas and used water cannons to stop them from marching to the Energy Ministry.
More protests are planned for Thursday