PARIS — Thousands of angry Bosnians took to the streets on Friday for a fourth day of protests against the political paralysis and economic stagnation that have engulfed one of Europe’s poorest and most divided countries.

In protests being called the Bosnian Spring for the sheer depth of their intensity, unemployed youths, war veterans and disgruntled workers, among others, set fire to government buildings in Sarajevo, Bosnia and Herzegovina’s capital, and across the country.

The Bosnian news media reported that hundreds had been injured during the protests, including dozens of police officers, with bursts of violence in Sarajevo, in the northern city of Tuzla, in Mostar in the south, and in Zenica in central Bosnia.

Srecko Latal, an analyst at the Social Overview Service, a research organization based in Sarajevo, said in a telephone interview that the capital looked like a “war zone,” with cars set on fire and overturned, buildings burning, and smoke from tear gas billowing into the sky. He said protesters had attacked the headquarters of the Bosnian presidency on Friday, a potent symbol of the country’s chronic dysfunction.