article_snippet.sent: Timothy McVeigh and Terry Nichols, former U.S. Army soldiers, were convicted of the Oklahoma City bombing.
article_snippet.sent: Timothy McVeigh was executed in 2001, and Nichols is serving a life sentence.
article_snippet.sent: the FBI was classified as the largest act of domestic terror until the Oklahoma City bombing.
article_snippet.sent: the Oklahoma City bombing killed a physics researcher, severely damaged a building at the University of Wisconsin and damaged 26 others.
article_snippet.sent: Homegrown extremist threat remains 20 years after the Oklahoma City bombing .
highlights_snippet.sent: April 19 marks 20 years since the Oklahoma City bombing .
  
highlights_snippet.sent: the Oklahoma City bombing was carried out by domestic terrorists .
  