Iowa police have captured a man suspected of killing two police officers in two unprovoked attacks.
The two officers were sitting in their patrol cars when they were killed in two separate incidents.
46-year-old Scott Michael Greene was taken into custody just hours after police named him as their main suspect, a police spokeswoman in Urbandale, Iowa has confirmed.
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Greene, who is yet to be formally charged, had recently run-in with local police after waving a Confederate flag in the crowd while the national anthem was played during a high school football game, Urbandale Police have confirmed.
The Confederate battle flag is a racially charged symbol in the United States, serving as a symbol of Southern heritage but also of slavery and white supremacy.
The shootings come as the latest in a string of attacks on police in the United States, as intense public debate over race and criminal justice in the country heats up.
52 US police officers have been fatally shot while on duty this year, which is a 58 per cent increase from 2015, according to the National Law Enforcement Officers Memorial.
Des Moines police confirmed with a news conference that Greene is Caucasian, as well as the two officers involved.