Several protesters have been arrested after tens of thousands of people demonstrated in Belgrade against the planned extraction of lithium in Serbia. Following a call from several environmental protection associations, people gathered in a central square of the Serbian capital on Saturday evening under the slogan “There will be no mines.” Between 24,000 and 27,000 people took part in the protest, according to police estimates, while non-governmental observers put the figure at around 40,000. Some of the protesters occupied the tracks at two stations in the Serbian capital, thus blocking train …