Anzac Day originally commemorated a battle on the Gallipoli peninsula in Turkey during World War One
Security forces detained 516 people while dispersing the protesters last Friday but have now released many of them, the national guard press office told a briefing.
On Saturday President Shavkat Mirziyoyev dropped plans to amend articles of the constitution concerning Karakalpakstan's autonomy and its right to secede. He also declared a month-long state of emergency in the northwestern province.
According to official reports, protesters marched through the provincial capital of Nukus last Friday and then tried to seize local government buildings.