Saudi behind Navy base rampage appeared to live a double life on social media. Why were red flags missed?

Mohammad al-Shamrani has over 2,700 tweets under his name. While the alleged killer’s motivations remain a mystery, newly-obtained information about his social media presence offers clues about his mindset before his lethal shooting spree last week at a naval base in Pensacola, Florida.

Source: Saudi behind Navy base rampage appeared to live a double life on social media. Why were red flags missed? – CNN