JAKARTA, Indonesia - Poisonous fumes from an Indonesian volcano killed six teenagers who were camping on the mountain, a doctor said Sunday.

Indonesia has more active volcanoes than any other nation and climbing them when they are not especially active is a popular pastime. Salak, where the teens died Saturday, is just south of the Indonesian capital, Jakarta, and is one of the country's most popular peaks.

Jusuf Fauzan, a doctor at a hospital in the nearby town of Bogor, said families of the victims had refused autopsies, but the dead were believed to have been poisoned by gases from one of two craters on the volcano. The six were found with blood and foam on their mouths and noses, he said.

The victims, between 14 and 16 years old, were among about 50 students spending the weekend on the mountain, media reports said. Their bodies were evacuated from the 7,152 feet peak on Sunday.