A man runs through tear gas fired by riot police Friday in Istanbul, Turkey.

Police officers attacked a group of peaceful demonstrators Friday in Istanbul’s Taksim Square with water cannons and tear gas, sending scores of people, protesters and tourists alike, scurrying into shops and luxury hotels and turning the center of this city into a battle zone at the height of tourist season.

The police action was the latest violent crackdown by the government against a growing protest movement challenging plans to replace a park in Taksim Square, Istanbul’s equivalent of Cairo’s Tahrir Square, with a replica Ottoman-era army barracks that would house a shopping mall.

But while the removal of the park, which is filled with sycamore trees and is the last significant green space in the center of Istanbul, set off the protests at the beginning of the week, the gatherings have broadened into a wider expression of anger against the heavy-handed tactics and urban development plans of the government and its leader, Prime Minister Recep Tayyip Erdogan.