Uvalde (United States) (AFP) – Desperate parents scuffled with police and pleaded with them to storm the Texas school where a gunman ultimately killed 19 children and two teachers, new video showed Thursday, as questions mounted over the authorities’ response to the massacre. In one jolty, nearly seven minute clip posted on YouTube, parents living a nightmare — a school shooting under way with their kids inside — are seen screaming expletives at police behind yellow tape trying to keep them away from Robb Elementary School in the town of Uvalde. “It’s my daughter!” one woman bellows amid cha…