The first US-bound caravan that’s packed with Honduran migrants has reached Mexico’s southern border, according to a report.

The Mexican government said authorities were in the process of explaining the migrants’ options after they arrived Thursday at the border with Guatemala, CBS News reported.

They’re also helping those seeking refugee status.

Officials in Mexico have said the 4,000 or so Hondurans will not be allowed to enter the country as a group and must have a passport or visa — or apply for refugee status.

Mexican Ambassador to the US Geronimo Gutierrez called the influx of migrants a “humanitarian crisis,” CBS said.

The exodus has drawn the ire of President Trump, who threatened to mobilize the military and close the southern border if Mexico doesn’t “stop this onslaught.”

The total of people fleeing poverty and violence in Honduras has swelled to 4,000 people, many of whom are children traveling with or without their parents and have been traveling since earlier this week.

Trump also warned Honduras that the US would yank money and aid to the country if it didn’t stop the migrants.