BROWNSVILLE, Texas (AP) The U.S. Homeland Security Department said Saturday that Texas denied federal agents access to a stretch of border when they were trying to rescue three migrants who drowned.

The federal governments account came hours after U.S. Rep. Henry Cuellar said the Texas Military Department and Texas National Guard did not grant access to Border Patrol agents to save the migrants Friday night. Mexican authorities recovered the bodies of a woman and two children Saturday across the border from Eagle Pass, Texas.

This is a tragedy, and the State bears responsibility, said Cuellar, the top Democrat on the House Appropriations Committees subcommittee for homeland security, in a statement.

The drownings come amid escalating tensions between Texas and the U.S. government over immigration enforcement. On Friday, the Justice Department told the U.S. Supreme Court that Texas had taken control of an area in Eagle Pass known as Shelby Park and were not letting Border Patrol agents enter.

The Texas Military Department said in a statement Saturday night that one of its units had searched the river after Border Patrol alerted them of the situation but did not find any migrants. The statement did not address the U.S. governments claims that Texas authorities had physically barred Border Patrol agents from entering the park at the time.

Homeland Security echoed Cuellars account of the distress call. In a filing to the U.S. Supreme Court on Saturday, Texas acknowledged seizing the city park on the border but said the federal government had mischaracterized its actions and it was trying to resolve any disputes over access.

In responding to a distress call from the Mexican government, Border Patrol agents were physically barred by Texas officials from entering the park, Homeland Security said in a statement. The Texas governors policies are cruel, dangerous, and inhumane, and Texass blatant disregard for federal authority over immigration poses grave risks.