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epaselect epa05421201 Dallas Police Department Chief David Brown speaks during the Dallas Strong Candlelight Vigil at the Dallas City Hall Plaza in Dallas, Texas, USA, 11 July 2016. Five Dallas police officers died after an ambush assault by a gunman during a protest rally in Dallas on 07 July. US President Barack Obama will arrive to Dallas on 12 July to participate in a memorial service.  Erik . Lesser/EPA