A tornado killed at least 500 people and devastated more than 20 villages in central Bangladesh, the government said Thursday. The tornado Wednesday night blew away people, houses and animals as it whirled at 100 mph through the Manikganj area, 25 miles northwest of Dhaka. Survivors said the funnel cloud raged for 10 minutes and flattened everything, including buildings. "I saw black clouds gathering in the sky. In moments we found we were flying along with the house," said Sayeda Begum, a 30-year-old homemaker in Saturia village near Manikganj. The storms hit hours after President Hussain Muhammad Ershad ordered nationwide prayers for rain in the midst of a drought.