Answer:
Timothy McVeigh and Terry Nichols were responsible for bombing the Federal Building in Oklahoma City.
Step-by-step explanation:
Just a small correction, the building was not bombed in 1996. The bombing took place in April 19 of 1995. The extremists Timothy McVeigh and Terry Nichols were responsible for the detonation of a truck with explosives that destroyed the Federal Building and killed at least 168 people. Other 680 were injured in the attack.