Broward County deputies received at least 18 calls warning them about Nikolas Cruz from 2008 to 2017, including concerns that he planned to shoot up the school" and other threats and acts of violence before he was accused of killing 17 people at a high school. The warnings, made by concerned people close to Cruz, came in phone calls to the Broward County Sheriff's Office, records show. At least five callers mentioned concern over his access to weapons, according to the documents. None of those warnings led to direct intervention. In February 2016, neighbors told police that they were worried he "planned to shoot up the school". The new details add to the growing list of red flags missed by law enforcement officials, including the FBI, in the months leading up to last week's mass shooting at Marjory Stoneman Douglas High School. The FBI is reviewing why a tip last month called into the agency about Cruz's desire to kill people was not forwarded to Miami agents for investigation. The Sheriff's Office has since opened two internal affairs investigations looking into whether its deputies followed the department's standards after receiving two phone calls. After the February 2016 call, a deputy forwarded the information to the Stoneman Douglas School Resource Officer, Deputy Scot Peterson. Peterson, 54, retired after an internal investigation was launched into why he sat outside the school for about four minutes and never entered as the shooter killed students and staff.