Chinese authorities say two schoolchildren aboard an overloaded bus that plunged into a pond are among the dead in the latest round of flooding in the country's south.

At least 45 have died and 19 are missing in the floods that have ravaged mountain districts of six provinces and autonomous regions. They include 10 dead and six missing in the collapse of a building in the city of Guiyang following a landslide.

The Guangxi regional government said Saturday another 21 kindergarten students were sent to the hospital in the school bus accident on Friday, with three listed in serious condition. The bus was licensed to carry 11 people, but had a total of 26 aboard.

It says the driver, teachers and school administrators have been taken into custody.