Former Georgian President Mikheil Saakashvili has been detained in Ukraine's capital Kiev, days after his supporters freed him from a police van.
While Saakashvili has a core following, he enjoys limited support in Ukraine.
Protester Igor Ognyov, from the eastern city of Sumy, told The Associated Press that the police stormed the camp before dawn on Wednesday.
Ukraine's parliament bowed yesterday to pressure from its Western lenders and delayed voting on legislation giving it the power to remove heads of the country's nascent anti-corruption agency.
Mikheil Saakashvili was reportedly detained by the Ukrainian security forces last night, the Ukrainian media said.More news: Kevin de Bruyne says 20 wins are nothing without trophies
As of 2200 GMT, a few hundred protesters had gathered near the facility not far from the parliament, shouting 'Shame!' while a large number of police in riot gear stood guard.
Saakashvili later said police had searched the wrong tent at the camp, continuing a surreal hide-and-seek game between him and Ukrainian law enforcement ever since he barged across the border from Poland three months ago.
Prosecutor General Yuri Lutsenko says his office has evidence that Saakashvili's representative received $500,000 to finance protests from Ukrainian businessmen with ties to Russian Federation.
His detention was the latest twist in a prolonged feud between the Ukrainian authorities and Saakashvili, who has turned on his one-time patron Poroshenko, accusing him of corruption and calling for his removal from office.
Prosecutor General Yuriy Lutsenko said the 49-year-old anti-corruption campaigner was arrested on charges of trying to stage a coup sponsored by Russian Federation.