Law enforcement officials prevented an explosive device from detonating near the home of liberal billionaire George Soros in Katonah, N.Y., in Westchester County.

The device detected Monday was “proactively detonated” by bomb squad technicians, a law enforcement official told the New York Times. It’s uncertain if Soros was on the premises when the bomb was found.

Federal and state law enforcement officials responded to the incident, and the Bedford Police Department and the Westchester County Department of Public Safety examined the area Monday evening. The police said a hazardous device unit had been summoned, but the police declined to comment further.

The FBI and the Bureau of Alcohol, Tobacco, Firearms and Explosives did not respond to requests for comment from the Times, nor did Soros’ foundation.

Soros is a political activist who backs Democratic candidates and has been the subject of multiple conspiracy theories, including those perpetuated by President Trump. Earlier this month, Trump tweeted that protesters who approached lawmakers about now-Supreme Court Justice Brett Kavanaugh were “paid for by Soros and others.”