Students begin school year at Florida school, six months after massacre

Students at Florida's Marjory Stoneman Douglas high school began a new school year amid beefed up security six months after a mass shooting that claimed 17 lives and rekindled the US debate over guns. "It's never going to be normal again," said Lauren Hogg, a 15-year-old survivor and co-author with her brother David of a book about the wave of student activism set off by the Parkland, Florida massacre.

"I can't help but constantly think about not only myself and my friends at my school, but constantly thinking about my friends at other schools who don't have as many safety precautions as we now do, and I worry about them," she told the ABC News.