Arrests in Aitkin County and charges are increasing, but in early March, 70 people were arrested in Grand Rapids, Minnesota, charged with Unlawful Assembly as they gathered to commemorate the largest oil spill in history in a March 3 gathering. The spill was the LaPrairie River Spill of an Enbridge line, in l99l. The spill sent l.7 million gallons of tar sands spewing into the river.