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MUNICH, GERMANY - JULY 22:  Police officers search a man outside the shopping center as they respond to a shooting at the Olympia Einkaufzentrum (OEZ) at July 22, 2016 in Munich, Germany.  According to reports, several people have been killed and an unknown number injured in a shooting at a shopping centre in the north-western Moosach district in Munich. Police are hunting the attacker or attackers who are thought to be still at large. (Photo by Joerg Koch/Getty Images)
MUNICH, GERMANY - JULY 22:  Police officers search a man outside the shopping center as they respond to a shooting at the Olympia Einkaufzentrum (OEZ) at July 22, 2016 in Munich, Germany.  According to reports, several people have been killed and an unknown number injured in a shooting at a shopping centre in the north-western Moosach district in Munich. Police are hunting the attacker or attackers who are thought to be still at large. (Photo by Joerg Koch/Getty Images)

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    Munich shooting witness: Gunman was killing children

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Munich shooting witness: Gunman was killing children

Police in Munich, Germany, continue to investigate the deadly shooting spree that killed at least 8 people. U.S. officials are warning American citizens in Europe to take shelter. CNN's Barbara Starr reports.

Munich shooting witness: Gunman was killing children

Police in Munich, Germany, continue to investigate the deadly shooting spree that killed at least 8 people. U.S. officials are warning American citizens in Europe to take shelter. CNN's Barbara Starr reports.