The number of people trying to illegally cross Mexico’s U.S. border has dropped since new immigration rules took effect last week, a U.S. official said Wednesday.

Border police recorded fewer than 4,000 immigration arrests and deportations in the past two days, said Blas Nunes-Neto of the Department of Homeland Security.

According to him, 10,100 were registered daily in the week preceding the lifting of “Title 42”, a measure of a health nature that had come into force after the outbreak of the new coronavirus pandemic.

It was replaced on Friday by a new system, which provides for restrictions on the right to asylum.

US authorities are seeking to reduce the number of migrants trying to enter the country from Mexico – often exceeding 200,000 a month last year – for which opposition Republicans have been vocal in their criticism of Democratic President Joe Biden.

The new rules appear to be fulfilling their deterrent role, Mr Nunez-Neto said.

Migrant arrivals from South and Central America at the Mexico-US border also appear to be slowing, the official added.

The “CBP One” app, which was created to make appointments with US immigration services, allowed “tens of thousands” of applications to be received, it said.

More than 5,000 have been “processed” since May 12, he added.

Mr. Núñez-Neto noted, however, that “it is still too early to draw definitive conclusions from these first indications”.