The bus carrying 42 female sewing workers of a mattress company was travelling in Kanchanaburi, 130 kilometres (81 miles) north-west of Bangkok, police said, adding the bus driver was among the dead.
"The bus had a brake problem. It slipped and crashed into the tree," a police official said, adding police were investigating the cause of the accident.

Copyright AFP (Agence France-Presse), 2006