Mexican President Andres Manuel Lopez Obrador accused the Pentagon of spying on his government following leaks in U.S. media, and said he would begin classifying information from the armed forces to protect national security, writes Reuters.

His comments came several days after the Washington Post reported on apparent tensions between Mexico’s Navy and the Army, citing a U.S. military briefing revealed in online leaks of secret U.S. military records.

“We’re now going to safeguard information from the Navy and the Defense Ministry, because we’re being a target of spying by the Pentagon”, Lopez Obrador told his daily news conference.

A Pentagon spokesman said the U.S. Department of Defense has a “strong collaborative defense partnership” with Mexico’s Army and Navy, and that the entities tackle common challenges “while respecting each other"s sovereignty and respective foreign policy agendas”.

The Pentagon has previously called the leak a “deliberate, criminal act”.