Claudia Sheinbaum said the U.S. Justice Department itself has recognized that "74% of the weapons" used by criminal groups in Mexico come from north of the border.

A U.S. CBP officer allegedly involved in migrant smuggling on the Texas border was a member of a Mexican drug cartel, a federal agent testified.

U.S. military aircraft may have spied on drug cartels during recent flights near Mexican territory, the government said Tuesday. Mexico was aware of two such U.S. military flights in late January ...