The top headlines from the Fort Worth Star-Telegram on Friday, August 20, 2021, including the NTSB's ruling on the cause of a 2019 train derailment, a 6-year-old girl's death being treated as a homicide in River Oaks, Hood County's ICU beds hit 100% occupancy amid a COVID-19 surge and a teen who brought a gun to a Mansfield School will remain in juvenile detention pending further evaluation.