Dhaka, Dec. 3 -- Indonesian Reliwati Siregar gestured angrily at deforestation around her home on the island of Sumatra, where landslides and floods brought by a tropical storm killed more than 700 people in its deadliest disaster since a cataclysmic tsunami in 2004.

"Mischievous hands cut down trees . they don't care about the forests, and now we're paying the price," Siregar said at a temporary shelter near her home in Tapanuli, the worst-hit area, with about a quarter of the death toll, government data shows.

The landslides buried homes and crippled rescue and relief efforts, while floodwaters washed ashore dozens of logs, Siregar said.

"The rain did cause the flood, but it's impossible for it to sweep away this much wood," the 62-yea...