According to Omaha police, officers were called to the Walmart near 72nd and Pine streets around 9:20 a.m. on Tuesday. When officers arrived, they saw a woman, identified as 31-year-old Noemi Guzman, outside the store holding a knife to a 3-year-old boy, who was in a shopping cart, officials said. Officials said Guzman approached the caretaker with a knife, giving the caretaker commands to go in front of the shopping cart. Investigators believe Guzman stole the knife from the store. Police said Guzman followed the caretaker out of the store and into the parking lot. The caretaker was able to...