Supporters free Saakashvili from Ukraine police van

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 Polish border three months ago.

"We are going to parliament to demand the impeachment". The 49-year-old is facing the threat of possible extradition to Georgia, where he is wanted on criminal charges he says were trumped up for political reasons. Fourteen officers and two civilians were injured, some with broken bones and head injuries.

Saakashvili, who was a regional governor in Ukraine, fell out with Poroshenko over accusations that Kiev was failing to make good on the fight against corruption and was stripped of his Ukrainian passport.

Saakashvili was stripped of his Ukrainian citizenship while in the US earlier this year, rendering him stateless, but in September he crossed from Poland with the help of supporters. "There aren't any weapons", he said, calling for Ukrainians to demonstrate in front of parliament in the evening.

Poroshenko's office said prosecutors have evidence to back up the claims against Saakashvili, whom they accuse of receiving financing from criminals linked to former president Viktor Yanukovich who planned to overthrow the current government. Footage from the scene showed Saakashvili being taken away while several hundred protesters were blocking the road.

He has become an outspoken critic of Poroshenko, who he has accused of corruption.

During a raid by Ukrainian security authorities at his home on Tuesday morning, Saakashvili defiantly climbed onto the roof of his apartment building and gave a speech to supporters in the street below.

However, in a tense stand-off, Saakashvili's supporters freed him from the van with little police resistance. He stressed that Russian Federation does not view the Ukrainian people as its enemy.

It was their second unsuccessful attempt to arrest Saakashvili in as many days.

Vanessa Coleman