Chief Executive Officer and co-founder of the investment fund Hermitage Capital Management Bill Browder attends the "Prospects for Russia after Putin" debate in the Houses of Parliament, central London on November 18, 2014.  The event saw political activists, journalists and politicians discussing the state of Russia under Putin's control and the effects that his policies are having on the world. AFP PHOTO / LEON NEAL        (Photo credit should read LEON NEAL/AFP/Getty Images)
PHOTO: LEON NEAL/AFP/Getty Images
Chief Executive Officer and co-founder of the investment fund Hermitage Capital Management Bill Browder attends the "Prospects for Russia after Putin" debate in the Houses of Parliament, central London on November 18, 2014. The event saw political activists, journalists and politicians discussing the state of Russia under Putin's control and the effects that his policies are having on the world. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images)
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(CNN) —  

Bill Browder, a prominent financial manager and vocal Vladimir Putin critic, was briefly arrested in Spain on a Russian arrest warrant Wednesday.

“Urgent: Just was arrested by Spanish police in Madrid on a Russian Interpol arrest warrant,” Browder tweeted early Wednesday. “Going to the police station right now.”

He later tweeted out what he said was an image of the warrant.

Spanish authorities confirmed that the anti-corruption activist was arrested in Madrid, but had since been released.

“Browder had an international arrest warrant issued by Russia against him and that was the reason he was arrested,” a Spanish National Police spokesperson told CNN. “When he was at the police station we realized the arrest warrant wasn’t valid, so he was released.”

Chicago-born Browder is the founder and CEO of Hermitage Capital Management, an international investment fund. He was once the largest investor in Russia’s stock market and a supporter of the Russian President. But that all changed in 2005 when he was expelled from the country after being deemed a threat to national security.

Browder claims his expulsion was because of his criticism of Russian corporate governance.

In the years since, Browder has become a UK citizen and a fierce critic of corruption. He has been one of the main proponents of the Russia sanctions law in the US known as the Magnitsky Act – named for his former lawyer Sergei Magnitsky, who died in suspicious circumstances in 2009.

The Magnitsky Act, passed in 2012, provides US lawmakers with sweeping powers to freeze assets and place travel restrictions on foreign government officials involved in human-rights abuses.

02:38 - Source: CNN
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