Mexican officials in the city of Matamoros dispatched heavy machinery to clear out what they claimed were abandoned tents at the camp, the action was a likely sign of things to come. The United States has given clear signs, including temporarily closing key border rail crossings into Texas, that it wants Mexico to do more to stop migrants hopping freight cars, buses and trucks to the border. Mexico, desperate to get the border crossings reopened to its manufactured goods, started to give indications it would crack down a bit. López Obrador said Thursday that Mexico detained more migrants in the week leading up to Christmas than the United States did, with Mexican detentions rising from about 8,000 per day on Dec. 16 to about 9,500 on Dec. 25. Mexico already has over 32,000 soldiers and National Guard troopers — about 11% of its total forces — assigned to enforcing immigration laws.