A nearly 18,000-acre fire in and around Zion National Park was completely contained Saturday.

Nine hiking trails remained closed in the park from the Kolob Fire, which began burning June 24 and destroyed a horse trailer, two out-buildings, two vehicles, a cabin and a house, according to the National Park Service.

Three firefighters suffered minor injuries fighting the blaze.

Fire crews spent Saturday monitoring the area inside the fire line, which continued to smolder. Temperatures over the weekend were predicted to top 100 degrees.

The cause of the fire remains under investigation. It has been previously reported that it was believed to have been human-caused, but Park Service spokesman Murray Shoemaker said Saturday it is not clear if that is the case.