At least 37 people have been killed at an immigration detention center in a Mexican city on the US border after a fire broke out at the facility overnight, the AP news agency cited an official as saying on Tuesday.

Huge crowds gather across Mexico to oppose a government drive to shrink the independent electoral authority, saying the changes threaten democracy.

Mexican President Andrés Manuel López Obrador says his country will lead a movement to defend Cuba's sovereignty and to remove the US blockade of the country, in place since the 1960s.

Many of the hundreds of people who crossed the border into Texas this week have recounted multiple kidnappings across several days as they made their way to the United States. 

The wife of Mexico's president has accused American luxury fashion brand Ralph Lauren of plagiarizing indigenous designs, terming it an attempt to appropriate work of the country's pre-Hispanic cultures.

Mexico files a second lawsuit against the US firearms industry, after a Massachusetts court last month dismissed its first case.

Gunmen in southern Mexico stormed a town hall and killed the mayor in a broad daylight attack that left at least 17 others dead.