Police clashed for a second night Tuesday with protesters who oppose negotiations between Spain’s acting government and Catalan separatist parties over a possible amnesty for thousands involved in Catalonia’s independence movement.

Several protestors in Madrid waved Spanish flags and shouted insults against the acting prime minister, Pedro Sánchez, and some of them self-identified as “nazis” in chants. The protesters pushed against barriers set by police in riot gear, who responded with rubber bullets and by hitting the protestors with batons.