Venezuela announced Monday that extremist groups are allegedly planning to attack the closed U.S. Embassy in Caracas with explosives amid rising tensions over U.S. military activity in the Caribbean.

National Assembly President Jorge Rodríguez said the U.S. was warned through multiple channels about a “false-flag operation” by right-wing groups posing as supporters of President Nicolás Maduro.

The embassy, closed since 2019, still maintains a small security staff, and Venezuelan authorities say they have reinforced protection of the site.

The U.S. has not yet commented on the alleged threat, which was also shared with a European embassy acting as an intermediary, the Associated Press has reported.

The warning comes as both nations trade accusations—Washington calling Maduro a drug trafficker and Caracas denouncing U.S. naval deployments as a violation of its sovereignty.