Melee at the river.
Check it out:

More than 100 people pelted U.S. Border Patrol agents with rocks and bottles during a rowdy confrontation Sunday afternoon along the U.S.-Mexico border, federal authorities said.

Nobody was seriously injured and it’s not clear whether the crowd was trying to enter the U.S. illegally or hold a demonstration, but the sight of a large crowd surging beyond the border rattled nerves.

Agents said it harked to the days in the 1990s when migrants would run across the border en masse, in so-called banzai runs that would overwhelm agents. As the crowd on Sunday crossed the Tijuana River into California, more than one dozen agents responded to the border fence atop the levee and deployed pepper spray to hold them back, triggering the melee.

Several agents were hit in the arms and legs with rocks and one agent was hit in the head with a filled water bottle, officials said. The crowd eventually dispersed.
“It was extremely unusual,” said agent Timothy Hamill, an agency spokesman. “It was dangerous, very dangerous.”