A person in the crowd during President Trump's speech to the National Rifle Association on Friday threw a seemingly mobile phone on the scene as the president approached the podium, as shown on social media.
The video, taken by Bradley Brewer, shows the object being shot in the air and landing on stage to the left of Trump as he walks to the stage. The speech took place in Indianapolis.
The person believed to have thrown the item was removed from the event by the participants.
"Tweeted Katie Pavlich, a Fox News contributor. "He threw the stage to the left while POTUS was closer to the stage."
Fox News has contacted the intelligence service.
Former President George W. Bush threw a thrown shoe at an Iraqi journalist in 2008 during a press conference in Iraq: The shoe missed Bush, and the journalist was forcibly removed from the room.