Following the fatal shooting of a second US citizen in Minneapolis on Saturday, the Trump administration is coming under increasing pressure over the tactics being used by federal agents, as part of its crackdown on illegal immigration.
Critics across the political divide have been questioning the use of force in current operations, including Republican senators who have joined opposition Democrats in calls for a wide-ranging investigation into the incident.
President Donald Trump says his administration is "reviewing everything" and is sending his border czar Tom Homan to Minnesota to direct law-enforcement efforts there.
The White House says US Immigration and Customs Enforcement (ICE) officers and agents rank among the world’s most skilled and undergo rigorous training before going out into the field.
So who are the federal agents involved, and how far do their powers go?
The BBC’s correspondent in Washington Bernd Debusmann tells us more.
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