Here are answers to key legal questions on what immigration agents and protesters are allowed to do, and where there are gray areas in the law.

A shooting involving a US Border Patrol agent in Arivaca, Arizona, is under investigation, the Pima County Sheriff’s Department said.

The suspect is facing federal charges, including assault on a federal officer.

A person was shot in an incident involving U.S. Border Patrol in Arizona on Tuesday, according to a Pima County Sheriff spokeswoman.

Amado sits at the junction of Arivaca Road and Interstate 19. A Border Patrol checkpoint is located about two miles west of the interstate, which was closed due to the shooting. Buchanan said when the road is blocked, residents must detour more than 100 miles round-trip to get in and out of Tucson.

Minnesota mob turns violent as arrestees with criminal records allegedly damage property outside hotel where Border Patrol commander was staying.

A man was hospitalized after allegedly exchanging gunfire with Border Patrol agents in Arizona on Tuesday, according to the Department of Homeland Security and the FBI.

A man who was involved in a human smuggling operation was shot in an exchange of gunfire with the U.S. Border Patrol and after firing at a federal helicopter, authorities said.

Sen. Lindsey Graham defended DHS Secretary Kristi Noem and Homeland Security Advisor Stephen Miller after they called the man killed by Border Patrol a "domestic terrorist."