"What is @IlhanMN response to this violence? Will she condemn it?" Pierson, an advisor to Trump's re-election campaign, tweeted on Sunday.
Many online users quickly noted that the video had been posted on YouTube four years ago and reportedly shows Ukrainian forces firing missiles in Donbass, which has been swept up in conflict between government and Russian-backed separatists since 2014. (You can also use a reverse image search to find the YouTube video.)
Online users accused Pierson of using a misleading video in her comments about the Gaza violence. "Pull the video down and stop lying and gaslighting," one Twitter user wrote.
But the video in fact wasn't filmed in Ukraine. Aric Toler, a researcher for the open-source investigative website Bellingcat who focuses on Eastern Europe, tracked down the original video and found that it was taken in Belarus in 2014.
“I looked on Russian social media”
As soon as I saw the video, I knew I had seen it before. People said it was from Ukraine, but I had some doubts. I started doing keyword searches on VKontakte and other Russian social media sites for "Grad," the name of the artillery system in the video, and some other terms. I also tried searching different types of artillery exercises.
Then I searched the terms on YouTube and filtered them by the oldest. I eventually found a video published in 2014 showing the same scene, but from a slightly different angle.
It was filmed at the Polessky firing range in Belarus. I found lots of other videos with very similar-looking landscape, with similar tree lines.
It’s clear that this video is from 2014 or earlier, though I can’t fully determine the date. But it was likely filmed then because there were military exercises carried out in the area that year”.
Omar later called for an end to the violent clashes in Gaza. "The status quo of occupation and humanitarian crisis in Gaza is unsustainable," she wrote on Twitter.
If you want to learn more about verifying images online, check out our guide.