Organizations affiliated with liberal and progressive streams of Judaism call for reforms after latest mass killing, but others shy way from taking politically fraught stance

18-year-old Salvador Ramos, who killed 21 people in the deadliest US school shooting since 2012, also posted pictures of his rifles on Instagram that he bought after his birthday

Gunman barricaded himself in room and 'just began shooting anyone that was in his way'; police broke windows to let others escape before tactical officers stormed in and killed him

Latest massacre in Texas is part of a persistent, bloody cycle of classroom mass shootings in the country