"She is free," Wojciech Piktel, spokesman for the District Prosecutor’s Office in the northeastern Polish city of Suwałki, said, as cited by the AFP news agency.
"Following questioning, the prosecutor found no grounds to request detention pending extradition and decided to release her," he added.
Polish border guards detained Aysoltan Niyazova, a Russian national of Turkmen origin, on Saturday after she entered the country from Lithuania.
The arrest was made on the basis of a warrant issued by Turkmenistan, officials said.
Pussy Riot activists are outspoken critics of Russian President Vladimir Putin and have campaigned against the war in Ukraine, the AFP reported.
Niyazova had previously been detained and released in Slovenia and Croatia on the same Interpol warrant, it said.
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Source: AFP, themoscowtimes.com