The AP reports:

KIEV, Ukraine — Thousands of opposition activists on Wednesday protested the arrest of former Prime Minister Yulia Tymoshenko, clouding official celebrations marking the 20th anniversary of Ukraine's independence declaration.

Over 5,000 demonstrators, many of them clad in traditional Ukrainian white embroidered shirts, attempted to march on the president's office in Kiev, but were held back by police in riot gear who flooded the city's center. Smaller groups of protesters were later allowed onto the capital's main avenue. Continue reading.