Hundreds of Venezuelans have applied for asylum in Peru, and only a few hours after the country tightened their entry requirements.
New rules require Venezuelans to enter Peru to have a passport, not just a passport as before.
Similar rules were introduced last week in Ecuador just to be overturned by a court
Thousands of Venezuelans flee their country amid chronic food and drug shortages.
Like others too In the South American countries, Peru is trying to control the influx of people from Venezuela's economic crisis.
The United Nations, whose migration authority has warned that the continent is facing a refugee crisis similar to the one in the Mediterranean in 2015, founds a special regional coordination team.
What is? happens in Peru
The authorities in Lima have set a deadline on Friday at midnight for the enactment of the new passport rules.
Many Venezuelans have tried to start a new life in Peru – this is one of the areas in the region's fastest growing economies – traveling across Colombia and Ecuador.
On Friday, there was an onslaught of people on the Peruvian border, and Ecuador created a so-called "humanitarian corridor" by laying buses to bring migrants across the country.
Peruvian Prime Minister César Villanueva said that Venezuelans need to show their passport on the border does not mean that Peru is closing "the door" for migrants.
He said identity cards do not have enough information and could easily be forged.
Citizens of most South American countries can visit countries in the region without the need for a visa or even a passport. The Andean Community bloc – which includes Ecuador and Peru – also allows its citizens visa-free and passport-free travel, although Venezuela withdrew from the group in 2006.
400,000 Venezuelan migrants already live in Peru, most of whom arrived last year
On Friday, more than 2,500 people crossed the small Peruvian border town of Aguas Verdes, thousands more tried to reach Peru at the main crossing in Tumbes.
The Tumbes junction has reached about 3,000 people arriving in recent weeks
Race to the Border
By Katy Watson, BBC News, Huaquillas, on the peru-Ecuadorian border