We've got over 7,000 migrants there.
McAleenan said that migrants are also illegally crossing the border in Yuma, Arizona, where video shows parents literally dropping their children over the fence.
In the area around the U.S. -Mexico border, the Missing Migrants Project recorded 364 deaths in 2018 alone, with 97 of those who died having come from Latin America and the Caribbean, while 77 were from Central America.
The thousands of predominantly Central American migrants who have died or gone missing on the journey to the US are among 56,800 people-including refugees and asylum seekers-worldwide who have died or disappeared since 2014, the AP has found in a separate report.
Melanie Hernandez, a migrant at the new shelter, said the desperate situation created by the rain has "improved the humanitarian response" offered by Mexican and US non-governmental organizations, many of whom are offering clothes, medical care and some legal services.
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Le déplacement du président n'avait pas été annoncé, tout comme celui effectué dans une caserne de CRS lundi à Paris. Le président a été hué et insulté sur place, selon des observateurs.
Reuters reported that other migrants managed to squeeze through the fence on the beach.
"We've got a challenging and still potentially volatile situation in Tijuana", said Kevin K. McAleenan, the commissioner of U.S. Customs and Border Protection, on Fox News Tuesday morning.
Karen Mayeni, a 29-year-old Honduran mother with three children aged between 6 and 12, told Reuters that she was standing by and watching others penetrating the border and "waiting to see what happens".
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The attempt to cross into the United States illegally came just days after the migrants were transferred from one temporary shelter to another after it had become unsanitary.
With growing frustration at the length of the asylum process, migrants climb over the border fence that divides the United States and Mexico on Sunday near Las Playas de Tijuana, Mexico.
US authorities say they can process up to 100 asylum seekers a day.
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Further, there is the threat of hepatitis, and several of the migrants have lice and skin infections, the spokesperson said. That rule was struck down last month by a federal judge. "That's not fair. How do you think people from Tijuana feel toward those people who are making problems?"