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Footage captures the panic after first shots were fired in downtown #Dallas Thursday night. https://t.co/00c6j6UZYm https://t.co/P2K9Z0dYr7

— ABC News (@ABC) July 8, 2016

Texas Gov. Greg Abbott said in an open letter in The Dallas Morning News today, \"Justice will be served, but justice is small solace for the families left behind. We mourn for the families of the fallen, for the law enforcement community and for our nation.\"

\"Respect for our law enforcement officers must be restored in our nation … For law enforcement officers to stand in front of us and all that threatens, we must stand behind them,\" he wrote. \"Every life matters. With each innocent life lost, we lose more of our humanity.\"

\"I ask for your prayers — for our law enforcement officers, for the city of Dallas, for our state and for our nation,\" Abbott said. \"I have faith in the goodness of Texas, of America. For in the end, evil always fails.\"

The shooting deaths of Sterling and Castile — parts of which were captured on video — sparked outrage and led to demonstrations across the country. The Department of Justice is investigating Sterling's death and is monitoring the investigation into Castile's.

Get real-time updates as this story unfolds. To start, just \"star\" this story in ABC News' phone app. Download ABC News for iPhone here or ABC News for Android here.

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