The University of Washington firebombing incident was an arson which took place in the early morning hours of May 21, 2001 when a firebomb was set off at Merrill Hall, a part of the University of Washington's Center for Urban Horticulture, causing an estimated $1.5 to $4.1 million in damages. By 2012 four of five accused conspirators behind the attack admitted their guilt in plea bargains. A fifth committed suicide in federal detention while awaiting trial.