Update: Officials Received Notice Large Number of Migrants Planned to Rush Border at San Ysidro, Prompting Action

U.S. Department of Defence personnel install barriers requested by Custom and Border Protection at the San Ysidro port of entry in San Diego, California under the Operation Secure Line anticipating the arrival of Central American migrants heading towards the border, as seen from the Mexican side of the border in Tijuana, Mexico, on Nov. 13, 2018. Getty Images/AFP/GuillermoArias

All northbound lanes at the San Ysidro Port of Entry were closed early on Nov. 19, blocking traffic into the United States from Mexico, but some lanes reopened around 7:30 a.m.

The lanes were closed so that U.S. Customs and Border Protection (CBP) personnel could place “port hardening materials” in place, the agency said. Secretary of Homeland Security Kirstjen Nielsen later said that CBP officials were notified that a large number of migrants from the caravan “were planning to rush the border in an attempt to gain illegal access to the U.S.”