(CNN)Tensions flared on Mexico's southern border Monday as troops tried to intercept a large group of migrants who'd crossed into the country.
Video and photographs taken at the Mexico-Guatemala border showed Mexican National Guard troops chasing migrants who'd rushed across the Suchiate River.
Some images showed migrants scrambling to evade authorities. Others showed a migrant pinned to the ground, surrounded by men in camouflage.
The migrants -- largely from Honduras -- are part of a new caravan that's been trekking north for days. It's the first migrant caravan to form since the Trump administration hashed out a series of deals with Mexico and several Central American countries aimed at stemming migration.
And its arrival in Mexico is already testing authorities on both sides of the border.
For months Mexican authorities, facing mounting pressure from US officials, have stepped up their show of force at the country's northern and southern borders. Dramatic visuals -- like troops running after mothers and children or blocking large groups of migrants walking along a highway -- have prompted many to say that Mexico, in effect, has already built Trump's border wall by increasingly cracking down on immigrants.