From cbp.gov:

A Tucson Station Border Patrol agent was assaulted by a 22-year-old Mexican man Friday morning near Highway 286, north of Sasabe, Arizona.

When the agent responded to a group of suspected illegal aliens north of the international boundary and attempted arrest one of the suspects, the Mexican national violently resisted by throwing dirt in the agents face and assaulting him. The agent managed to subdue the suspect after a brief struggle.

https://www.cbp.gov/newsroom/local-media-release/border-patrol-agent-assaulted-near-sasabe-ariz