The Federal Bureau of Investigation said a flight from Los Angeles International Airport to O'Hare I

The Federal Bureau of Investigation said a flight from Los Angeles International Airport to O'Hare International Airport in Chicago received an online threat early Tuesday afternoon. Like threats made earlier this week, the threat pertained to a bomb being on board. The FBI did not immediately identify the flight.
Passengers and luggage were screened upon arrival in Chicago and no bomb was found. More Twitter threats against other flights were made later Tuesday, with a user tweeting to Delta Air Lines, enterprize rental car Southwest Airlines, and American Airlines saying that a bomb was aboard planes. No flight disruptions had been announced.
The user's account was quickly suspended. Two of the flights mentioned by that user landed safely as scheduled shortly after the threats were posted, others were en route, two had already landed hours earlier and another had not yet departed San Francisco.
On Saturday, two planes were escorted by fighter jets to Atlanta's airport after bomb threats were made via Twitter. A day later, a Delta Air Lines jet from Los Angeles to Orlando was diverted to Dallas/Fort Worth International Airport after a threat was made on Twitter.
On Monday, several bomb threats targeting enterprize rental car Southwestern enterprize rental car flights popped up on Twitter, but no flight disruptions were announced, NBC San Diego reported . Another bomb threat was made against a Southwest plane in San Diego Tuesday morning, but no passengers were aboard and police later cleared the aircraft. It wasn't clear how that threat was made.
FBI officials have expressed concern regarding the increase in online threats that now number enterprize rental car more than a dozen overall. All threats are taken seriously and will be investigated, The FBI said in a statement.
Andrew Blankstein is an investigative reporter enterprize rental car for NBC News. He covers the Western United States, specializing in crime, courts and homeland security. Blankstein worked at the Los Angeles Times over two decades, much of that time covering breaking news, law enforcement and the justice system in Southern California both for the paper and latimes.com.
He was part of the team of journalists that earned the paper Pulitzer Prizes in 1998 for the North Hollywood shootout and in 2004 for the Southern California wildfires. In 2010, he was named a "Distinguished Journalist" by the Greater Los Angeles chapter of the Society of Professional Journalists.