Protesters gathered on Sunday in drought-hit northern Mexico in an attempt to retain control of a dam key to government efforts to diffuse tensions over a water-sharing pact with the United States.
Mexican President Andres Manuel Lopez Obrador, who has been working to maintain a good relationship with U.S. President Donald Trump, said on Friday that Mexico must comply with its obligations.
Under the 1944 treaty, Mexico must deliver 1.75 million acre-feet of water to the United States over a five-year period.
Mexico also gets U.S. water from the Colorado River.
Texas Governor Greg Abbott last week asked the State Department to help enforce the agreement. Mexico has until October 24 to meet a five-year quota, and owes nearly a year’s supply of water, Abbott said.
Protesters took control of the La Boquilla dam in Chihuahua, which borders New Mexico, in September. A week ago, a protester was killed in gunfire from the Mexican National Guard after the early protest.
Anger boiled over amid plans to divert additional water at the dam due to obligations.
Several protesters told Reuters the water is being "stolen" and that they had gathered because they worried the National Guard would recover control of the dam.
"We're here united to defend Chihuahua, defend the water they're stealing from us," said Marisa Flores, 60.
The National Water Commission of Mexico shows in its drought monitor that large parts of Chihuahua have suffered moderate and severe drought for more than six months. Neighboring states Sonora and Coahuila are also affected. Along the U.S. border in Chihuahua state, several areas on the commission's drought monitor are marked as in severe drought. Much of the rest is marked as abnormally dry.