Two immigration agents may have made "untruthful statements" in sworn testimony about the shooting of a migrant in Minneapolis last month, Immigration and Customs Enforcement (ICE) has said.
ICE acting director Todd Lyons said the two officers, who have not been named, were immediately placed on administrative leave pending an internal investigation.
"Lying under oath is a serious federal offence," Lyons said. On Friday, a judge granted a request to drop charges against two men who were accused of attacking the officers.
The Department of Homeland Security initially said a federal officer shot a man in the leg after being attacked with a shovel and broom handle by three migrants on 14 January.
On Friday, Lyons said in a statement that the two officers appeared to have provided inaccurate testimony, and that the US attorney's office was actively investigating the matter.
