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 US President Donald Trump, said on Friday that Mexico has to comply with its obligations. Under the 1944 treaty, Mexico must deliver 1,750,000 acre-feet of water to the United States over a five-year period. Mexico also gets US 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 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. “This is the most critical time we’ve been living in Chihuahua.”