More than 50 commercial flights, 50 have been threatened in less than two weeks. Many of them threats of a bomb on board. These threats are being delivered via social media. The fbi and Homeland Security tonight saying they are investigating. The Homeland Security secretary telling cnn the threats have taken off since january 17th. Multiple threats coming in every day, he tells us. Some of them allegedly from isis. He considers the threats dangerous. The fbi said an American Airlines flight from los angeles to chicagos Ohare Airport received an online threat of a bomb on tuesday afternoon. That flight did land safely. A united flight newark to miami threatened the same day. Renee marsh is out front at new Yorks Laguardia airport. Renee, this is a horrible thing thats happening and it is alarming. Reporter the threats definitely are alarming. It used to be that bomb threats are called in but now theyre being sent via social media. So this is a relatively new type of way of delivering th