SAN ANTONIO  - Six people believed to be undocumented immigrants died and another nine were injured, after the pickup truck they were in slammed into a security barrier at a US Navy base in Texas, officials said. The accident at Naval Air Station Kingsville, in rural Kleberg County south of Corpus Christi, happened as a Kingsville police officer was pursuing the pickup truck through town, said Senior Corporal Charlie Ramirez of the Texas Department of Transportation.