ISTANBUL, Turkey (CBS) -- Turkish police clashed with protesters in Istanbul on Wednesday (May 1), firing tear gas at groups of people trying to make it to the city's Taksim Square.
The local authorities had declared the square off-limits for May Day celebrations, closing down much of the city's transport network.
Riot police fired tear gas and water cannon, while protesters hurled stones.
May Day is traditionally marked by rallies by labor unions.
Leftists and Kurdish separatists regularly clash with police at demonstrations in Turkey and the May Day protests have turned violent in the past.
Taksim square was closed to workers' demonstrations after 37 people died in a shooting by an unknown gunman or were trampled to death on May Day in 1977.
The ruling AK Party government allowed the square to be reopened for May Day rallies for the first time in 2010.