( CNN ) -- Veteran director Barry Levinson has been tapped to direct a `` political thriller '' based on the 1995 bombing of a federal courthouse in Oklahoma City . Sources with knowledge of the project say the tentative title of the film is `` O.K.C . '' The script is being written by Clay Wold and is based on the story of his brother , who was a young legal clerk on the defense team for Timothy McVeigh . Among Levinson 's directing credits are `` Good Morning , Vietnam , '' `` The Young Sherlock Holmes '' and `` The Natural . '' Oklahoma City was the site of the worst terrorist attack on U.S. soil before September 11 , 2001 . The 1995 bombing of the state capital 's federal building left 168 dead . McVeigh , a white supremacist anti-government activist and former U.S. soldier , was executed for the attack in 2001 . CNN 's Douglas Hyde contributed to this report .
Oklahoma City is the site of the worst terrorist attack on U.S. soil before September 11 , 2001 . The 1995 bombing of the state capital 's federal building left 168 dead . The tentative title of the film is `` O.K.C. , '' sources with knowledge of the project say .