Occupy Wall Street protesters clashed with the NYPD late last night as the demonstrators marked their sixth-month anniversary.

Around 300 people gathered in Zuccotti Park and some began constructing a tent — a violation of the park’s rules — while others held pop-up tents over their heads.

Then cops informed them the park was closed, and the battle ensued.

One person threw a glass Snapple bottle towards officers while protesters complained of being shoved to the ground.

Dozens were taken into police custody early today.