 On 20 April 2010 BP's offshore Deepwater Horizon oil rig exploded killing eleven workers and precipitating the largest accidental offshore oil spill in the history of the petroleum industry.On 3 May the Louisiana Bucket Brigade (LABB) publicly released the Oil Spill Crisis Map, the first application of the Ushahidi platform in a humanitarian response in the United States.In the years since the BP oil spill, LABB continues to use the map (now the iWitness Pollution Map) as a repository of eyewitness reports and photos documenting the impacts of petrochemical pollution on human health and the environment.