Separate shootings in El Paso, Texas, and Dayton, Ohio, have left a total of 29 dead and 52 injured.In El Paso, 21-year-old Patrick Crusius is accused of opening fire at a shopping center and Walmart. .After killing 20 people and injuring 26, Crusius surrendered to officers. Crusius posted a racist manifesto against immigrants on the message board 8Chan just before the shooting.Federal authorities are treating the shooting as domestic terrorism, according to CNN.It is one of the worst mass shootings in U.S. history. .Our community will not be defined by this senseless act of violence, El Paso Mayor Dee Margo, via Twitter.In Dayton, Ohio, 24-year-old Connor Betts fired an assault rifle into a nightlife district around 1 A.M. .One of the nine killed included his sister. .Betts was killed by police after the shooting. .A motive remains unclear. .