El Paso shooting at Walmart leaves multiple fatalities

* Police say one person in custody after shooting at mall* Local TV reports 18 people hurt but extent of injuries unknownDowntown El Paso in west Texas. Photograph: Denis Jr Tangney/Getty ImagesMultiple people have been killed in a shooting at a Walmart in El Paso, Texas, according to local law enforcement and the city’s mayor.One person was in custody, a police department spokesman said in a televised briefing.“It’s an absolutely tragedy,” El Paso’s mayor, Dee Marg