MIAMI (CNN) — A double-decker bus crashed into an overpass at the Miami airport, killing two passengers, authorities said Saturday.

The driver of the tour bus mistakenly entered Miami International Airport, attempting to enter the lower concourse, police said. The bus was too tall to clear the overpass, and two passengers sitting on the top level died as a result.

One of the two victims died at a hospital, police said. Thirty other passengers were treated for injuries.