One person was killed and dozens were injured on Sunday night when a motorist drove onto a crowded sidewalk on the Las Vegas Strip, near the hotel and casino where the Miss Universe pageant was being held, officials said.An 11-year-old was among the injured, along with visitors from Montreal, Canada, said University Medical Center spokeswoman Danita Cohen. Some had requested translators, indicating they may have been tourists visiting the famous gaming and hotel destination.Las Vegas Metropolitan Police Deputy Chief Brett Zimmerman said the female driver, who was in police custody, may have plowed into victims intentionally. She had a 3-year-old in the car with her and was being tested for drugs and alcohol. The 3-year-old was not hurt.Zimmerman said police had ruled out the possibility that the crash was an act of terrorism. The United States is on high alert after 14 people were killed in an attack in the Californian city of San Bernardino earlier this month.Las Vegas authorities have given injury tallies ranging from 26 to 36 people, with as many as seven in critical condition.