According to a Missing Migrants Project, a joint research project by IOM's Global Migration Data Analysis Center (GMDAC) and Media and Communications Division (MCD) that tracks incidents involving migrants who have died and gone missing while trying to reach an international destination, as many as 3,341 migrant fatalities worldwide have been recorded so far in 2018.
Tents are set up in a new shelter on Sunday in an area known as El Barretal in Tijuana, Mexico.
Asylum seekers look past the U.S. -Mexico border fence, in Tijuana, Mexico, on November 30.
McAleenan also noted that criminals leading these caravans give the migrants misleading information about the muddy asylum process in the USA, meaning they profit off migrant families because of the weak immigration laws.
Thousands of migrants have been waiting for a chance to apply for asylum.
The inhospitable conditions have increased the apparent frustration of thousands of the caravaners, some of whom arrived at this Mexican border city two weeks ago.
Customs and Border Protection officials said that on the morning of December 3 security camera operators observed a group of six illegal aliens, including two small children, making their way over the border wall. They turned around and waved to those still on the Mexican side.
Since being transferred to the new shelter, Tijuana's municipal authorities have refused to provide details about the migrants.
They told the migrants food and medical services would no longer be provided there. The withdrawal of the city's authorities comes at the behest of Tijuana's mayor, Juan Manuel Gastelúm, who has repeatedly said he will protect Tijuana from disruptions from the caravan.
The near-4,000-person estimate for those who have died or gone missing counts 1,573 more people than previous estimates calculated by the United Nations.
The remaining migrants were taken by bus to the new shelter about 10 miles (15 kilometers) from the border crossing at Otay Mesa and 14 miles (22 kilometers) from San Ysidro, near where people line up to file applications for asylum in the United States.