An explosion inside a maintenance hole on the Texas Tech University campus in Lubbock set off fires and power outages, leading school officials to issue evacuation orders for several buildings and cancel classes for the rest of the week, university police said.

Texas Tech and Lubbock Fire Rescue officials were confirming an ongoing evacuation near the campus' engineering key as well as outages across the Tech and Texas Tech Health Sciences Center campuses following several fires and a power substation explosion Wednesday evening.

Texas Tech and Lubbock officials have provided a timeline and preliminary details as to what led to the overnight fires and explosions on campus.