http://www.nj.com/news/index.ssf/2012/10/kara_alongi_twitter_hoax_shows.html

Kara Alongi is a 16-year old who posted a tweet the day of a Sunday night at 6:12p.m. "There is someone in my hour ecall 911." This tweet created panic to many people especially police officers who tried to investigate the case. Many of these cases turn out to be false, in this case police officers had an idea it was false.