I-15 in southern Utah has been reopened to traffic after crews completed the cleanup of about 240 gallons of deadly sodium cyanide that spilled onto the roadway.

The Utah Highway Patrol said the cleanup was completed and the freeway reopened about 4 p.m. Sunday.The interstate had been closed from Scipio to I-70 since Thursday when 90 barrels of the pellets fell from a semi-trailer and spilled.

The cleanup effort was slowed by heat that quickly exhausted crews working in heavy rubber protective suits.

Traffic was diverted onto U-50, U.S. 89 and I-70.