Amnesty International said Monday it was calling for a probe into police action in response to protests over the Missouri shooting of Michael Brown.
"Amnesty International has a long and tested history of monitoring and investigating police conduct, not just in foreign countries, but right here at home in the United States," Steven Hawkins, executive director of Amnesty International USA, said in a statement.
The rights monitor sent a 13-person delegation to Ferguson to observe police tactics and to train demonstrators in methods of non-violent protest.
A report Monday from the New York Times says 18-year-old Brown died as a result of injuries sustained from six shots fired by police in Ferguson during an Aug. 9 confrontation.
Dr. Michael Baden, former chief medical examiner for New York City, who conducted an independent autopsy at the request of the Brown family, said the results are no indication of blame or intent.
Brown was unarmed at the time of shooting, but was the suspect in a robbery during the weekend of the fatal shooting.
"We want a thorough investigation into Michael Brown's death and the series of events that followed," Hawkins said.
Police in Ferguson have come under fire for responding to sometimes violent protests with military-style equipment.