opposition movement on Friday said its headquarters had been vandalized amid ongoing tensions over a disputed presidential election, as the country’s foreign minister said the U.S. was at the forefront of what the government calls a coup attempt.

Vente Venezuela, the movement headed by opposition leader Maria Corina Machado, said six unidentified men wearing hoods and carrying guns overpowered its security guards overnight, entering its Caracas headquarters, taking equipment and vandalizing the office.