Thai police arrest driver of school bus fire that killed 23

Rescuers gather at the site of a bus that caught fire, carrying young students with their teachers, in suburban Bangkok (Sakchai Lalit/AP)

Thai police have arrested the driver of a bus carrying young students and teachers that caught fire and killed 23 in suburban Bangkok, as families arrived in the capital on Wednesday to help identify their loved ones.

The bus carrying six teachers and 39 students in elementary and junior high school was travelling from Uthai Thani province, about 300 kilometres (186 miles) north of Bangkok, for a school trip in Ayutthaya and Nonthaburi provinces on Tuesday.