In the video which is now trending on social media sites, shows someone near the front row throwing the object. The US president Trump appeared to not have noticed the object being thrown at him as he continued his speech uninterrupted at the National Rifle Association conference.
Later during the speech in Indianapolis, Trump also threw something into the crowd later during his speech: a pen with which he signed an official document to withdraw the U.S. from a 2013 United Nations arms treaty.
Here are some of the Twitter reactions: