A woman in the border city of Laredo, Texas who was angry because she had been denied food stamps killed herself and shot and critically wounded her two children late on Monday. The woman, whom he declined to identify, pulled out a handgun and started walking through the office, threatening several employees, he said. She took an office supervisor hostage in a room in the office. After two hours of negotiations, the woman allowed the male supervisor to go free, but she remained in the office with her two children, a 10-year-old boy and a 12-year-old girl. "About 11:45 last...