US officials have re-opened America's busiest border-crossing with Mexico. The checkpoint in Tijuana, Mexico, was closed for several hours on Monday - so extra security barriers could be erected. Officials say they were afraid a wave of migrants from Central America might storm the crossing. But the migrants are not being welcomed on Mexico's side of the border either. CGTN's Alasdair Baverstock has details.

Tempers flare in Tijuana, central American migrants arrived here to a cold welcome. Across the border - where the U.S. president has compared them to invaders - it is likely to be colder still. The U.S. authorities here can only process around 100 asylum claims per day. That means a long wait for more than three thousand migrants already here. As many as 10,000 could pour into this city in the coming weeks. Joel Collado is one of the caravan organizers. He says there are people here who say they can't afford long delays.

JOEL COLLADO MIGRANT CARAVAN ORGANIZER "We are asking President Trump and the authorities to increase the number of people being admitted, which will help us overcome the uncertainty. We must remember there are children, pregnant women and old people here, and so this will make the entry process better."

The migrants will have their asylum claims reviewed, but having those requests granted is another matter. The rate of approval is low. Jan Joseph Bejar is a San Diego immigration attorney and has been closely watching the caravan's progress.

JAN JOSEPH BEJAR SAN DIEGO IMMIGRATION ATTORNEY "Each asylum application is supposed to be done, assuming the U.S. government does it properly and lawfully, on a case-by-case basis. You don't admit people en masse. When people come up in vast numbers it's impossible to determine who is going to get in and who is not. The United States grants very few asylum applications when you compare it with the number that actually apply."

While the caravan members may be frustrated, the perceived priority being given to them by the U.S. authorities has not gone down well in Tijuana-a city where a large proportion of the local population is made up of migrants.

GUADALUPE MONDRAGON MEXICAN MIGRANT "We've been here for a month-and-a-half waiting for something to happen. Yet this caravan arrives here and we get pushed to the side. I think it's bad."

As the caravan waits, it is left to the city of Tijuana to care for them.

ALASDAIR BAVERSTOCK TIJUANA, MEXICO "Tijuana's mayor compares the caravan to an 'avalanche' already overwhelming his city's social services. He estimates the migrants could be stranded here six months, at least, while U.S. authorities process their asylum applications. While this city marks the end of an arduous journey across Mexico, they are nowhere near the end of their ordeal. Alasdair Baverstock, CGTN, Tijuana."