MILWAUKEE (AP) — A large section of a cliff has given way at a Wisconsin power plant, creating a mudslide that swept a pickup truck and other equipment into Lake Michigan. No injuries or power disruptions were reported.The collapse occurred Monday morning at the coal-fired power plant in Oak Creek, a southern suburb of Milwaukee.We Energies spokesman Brian Manthey says all employees have been accounted for.Acting Oak Creek Fire Chief Tom Rosandich says the collapse sent a swath of debris about the size of a football field sliding toward the lake. He says authorities are investigating a sheen on the water most likely caused by fuel or hydraulic fluid.The cause of the collapse is under investigation. A meteorologist suspects it wasn't weather-related because rainfall has been unseasonably light.