There were two lightning-caused fires that started last week in the Grand Canyon National Park. On Thursday, fire crews responded to the Thumb Fire, located along the western rim of the Great Thumb Mesa. The fire has grown to over 38-hundred acres in size and is burning in pinon-juniper and brush. The one-acre Tipover Fire was detected Thursday north of Tiyo Point on the North Rim has been contained. Smoke from the Thumb Fire can be seen from the South Rim. Grand Canyon National Park is seeing an increase in wildfire starts due to recent monsoon activity.