The Federal Aviation Administration on Friday urged U.S. aircraft operators to “exercise caution” when flying over the eastern Pacific Ocean near Mexico, Central America and parts of South America, citing “military activities” and satellite navigation interference.

The warning was issued in a series of Notices to Airmen (NOTAMs) issued by the FAA. They say, “Potential risks exist for aircraft at all altitudes, including during overflight and the arrival and departure phases of flight.” Such notices are issued routinely in any region where there are hostilities nearby.

The notices come after nearly four months of U.S. military strikes against boats in the Caribbean Sea and the eastern Pacific that the U.S. alleged were trafficking drugs. After 35 known strikes that killed at least 115 people, according to the Trump administration, the U.S. conducted a “large-scale strike” against Venezuela. President Nicolás Maduro and his wife, Cilia Flores, were seized and transported to New York, where they face federal drug trafficking charges.