ALTOONA, Iowa -- At least three fire crews responded to the Adventureland theme park in Altoona Saturday afternoon.Adventureland spokeswoman Molly Vincent said the fire is contained to an area known as 'Main Street' inside the park and no one has been injured.The fire is so big, smoke could be seen from the Des Moines International Airport.Vincent said Adventureland is closed for the season. There is a popular gun show going on nearby, but it is not connected to the fire.KCCI viewer photos show a lot of smoke and fire billowing from shops inside Adventureland. Fire crews are keeping everyone out of the area.