A smoking volcano on Indonesia's main island of Java has forced the closure of a local airport. Mount Bromo came back to life last week after a yearlong lull, unleashing a powerful blast of volcanic debris but causing no injuries or serious damage.State volcanologist Surono warned, however, a bigger eruption may be on the way.Officials on Monday shut down the airport in Malang, a town 15 miles (25 kilometers) from the volcano, for five days.Indonesia, a sprawling archipelago of 235 million, has more active volcanoes than any other country in the world.Mount Bromo is one of Java's most popular tourist attractions.Villagers often climb the 7,641 foot- (2,329 meter-) high mountain to leave offerings at the peak.