Still image from undated video of a masked Islamic State militant speaking next to man purported to be U.S. journalist Steven Sotloff at an unknown location
REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THE CONTENT OF THIS VIDEO, WHICH HAS BEEN OBTAINED FROM A SOCIAL MEDIA WEBSITE. A masked Islamic State militant speaks next to a man purported to be U.S. journalist Steven Sotloff at an unknown location in this still image from an undated video posted on a social media website. Islamic State insurgents released the video on August 19, 2014 purportedly showing the beheading of U.S. journalist James Foley, who had gone missing in Syria nearly two years ago, and images of Sotloff whose life they said depended on U.S. action in Iraq. The video, titled "A Message to America," was released a day after Islamic State, an al Qaeda offshoot that has overrun large parts of Iraq, threatened to attack Americans "in any place." U.S. officials said they were working to determine its authenticity. REUTERS/Social Media Website via REUTERS TV ( Tags: CIVIL UNREST MEDIA) ATTENTION EDITORS - THIS PICTURE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS IMAGE. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. NO SALES. NO ARCHIVES. RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS
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School bus full of children gesture and chant "hands up, don't shoot" as they drive past the scene of where, according to local media, police shot dead a 23-year-old man wielding a knife in the St Louis area
A school bus full of children gesture and chant "hands up, don't shoot" as they drive past the scene of where, according to local media, police shot dead a 23-year-old man wielding a knife in the St Louis area August 19, 2014. The shooting follows a night where dozens of people had been arrested, marking the latest outbreak of rancor in the St. Louis suburb where calls for peaceful protests have been overshadowed by episodes of looting, arson and clashes with police over the last 10 days. REUTERS/Lucas Jackson (UNITED STATES - Tags: CIVIL UNREST CRIME LAW EDUCATION)
School bus full of children gesture and chant as they drive past scene of where, according to local media, police shot dead a 23-year-old man wielding a knife in the St Louis area
A school bus full of children gesture and chant "hands up, don't shoot" as they drive past the scene of where, according to local media, police shot dead a 23-year-old man wielding a knife in the St Louis area August 19, 2014. The shooting follows a night where dozens of people had been arrested, marking the latest outbreak of rancor in the St. Louis suburb where calls for peaceful protests have been overshadowed by episodes of looting, arson and clashes with police over the last 10 days. REUTERS/Lucas Jackson (UNITED STATES - Tags: CIVIL UNREST CRIME LAW EDUCATION)
Hicks holds the hand of Jackson as she joins crowd in protesting shootings by St. Louis Police at the scene where, according to local media, police shot dead a 23-year-old man wielding a knife in the St Louis area
Monique Hicks holds the hand of Kelsey Jackson as she joins a crowd in protesting shootings by St. Louis Police at the scene where, according to local media, police shot dead a 23-year-old man wielding a knife in the St Louis area August 19, 2014. The shooting follows a night where dozens of people had been arrested, marking the latest outbreak of rancor in the St. Louis suburb where calls for peaceful protests have been overshadowed by episodes of looting, arson and clashes with police over the last 10 days. REUTERS/Lucas Jackson (UNITED STATES - Tags: CIVIL UNREST CRIME LAW)
Man holds a sign protesting shootings by St. Louis Police at the scene where, according to local media, police shot dead a 23-year-old man wielding a knife in the St Louis area
A man holds a sign protesting shootings by St. Louis Police at the scene where, according to local media, police shot dead a 23-year-old man wielding a knife in the St Louis area August 19, 2014. The shooting follows a night where dozens of people had been arrested, marking the latest outbreak of rancor in the St. Louis suburb where calls for peaceful protests have been overshadowed by episodes of looting, arson and clashes with police over the last 10 days. REUTERS/Lucas Jackson (UNITED STATES - Tags: CIVIL UNREST CRIME LAW)
Men hold signs protesting shootings by St. Louis Police at the scene where, according to local media, police shot dead a 23-year-old man wielding a knife, in the St Louis area
Men hold signs protesting shootings by St. Louis Police at the scene where, according to local media, police shot dead a 23-year-old man wielding a knife, in the St Louis area August 19, 2014. The shooting follows a night where dozens of people had been arrested, marking the latest outbreak of rancor in the St. Louis suburb where calls for peaceful protests have been overshadowed by episodes of looting, arson and clashes with police over the last 10 days. REUTERS/Lucas Jackson (UNITED STATES - Tags: CIVIL UNREST CRIME LAW)