ISTANBUL -- Riot police firing tear gas and water cannons repelled thousands of anti-government protesters attempting to converge on Istanbul's central Taksim Square on Sunday, unbowed even as Prime Minister Recep Tayyip Erdogan defended his crackdown at a rally of his supporters.

A day after police quashed an 18-day sit-in at the square's Gezi Park, Erdogan spoke to hundreds of thousands of his supporters on one side of Turkey's largest city, and throngs of protesters angrily tried to regroup and reclaim Taksim. The square had become the symbolic center of defiance against Erdogan's government.

The contrast between the two events highlighted growing divisions in Turkish society, which many say have been exacerbated by Erdogan's fiery rhetoric as he faced down the most widespread protests in his 10-year tenure.

Although they have dented his international image and angered many at home, the protests are unlikely to prove a significant challenge to his government. He was elected with 50 percent of the vote just two years ago.

Labor unions called for a one-day strike that would include doctors, lawyers, engineers and civil servants in support of the protesters. Strikes, however, often have little visible impact on daily life in Turkey.

Police may have won the day Saturday by recouping control of the park, sending thousands of protesters running under a barrage of tear gas. But as night fell Sunday, demonstrators continued their daylong quest to reach Taksim Square, and protests emerged in other cities.

The Dogan news agency said Sunday that dozens of protesters were detained in Istanbul.

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