ISTANBUL — The public park at the center of last month’s antigovernment protests in Turkey, sealed off for weeks to keep demonstrators at bay, quickly became the scene of more unrest after reopening on Monday, offering a volatile reminder of how divided the government and its opponents remain.

Dozens of people were injured and at least 32 were detained after scores of them streamed back to the site, Gezi Park, after the governor announced its reopening around noon, news reports said. When a large group of people led by protest organizers marched toward the park, it was confronted by the police, who dispersed the crowd with water cannons and tear gas, detaining those who refused to leave.

The park, in Taksim Square, became a focal point of outrage in June that initially stemmed from concerns over a government-backed plan to redevelop the site, the only green area in the district.

But the harsh police crackdown that soon followed gave rise to protests in more than 60 cities, mushrooming into a broad movement against Prime Minister Recep Tayyip Erdogan and what critics call his autocratic style after his more than a decade in office.