A school bus has been filmed driving along a Cardiff road with the doors wide open.
The footage, shot by a student on board, shows the front doors open for the duration of the film despite the bus moving.
The bus is run by New Adventure Travel (NAT) Group and was on the 813 route between Lisvane and Ysgol Glantaf on Friday 6 December.
A NAT Group spokesperson said "there is no reason for a bus to be driven with the doors open, and any suggestion of that being the case would result in a formal investigation."
The mother of the school girl who captured the incident on camera said this is not the first time that the doors have opened "at random".
Not wanting to be named, she said she was particularly concerned for her daughter's safety.
My daughter is the last stop so never manages to get a seat.
She also claimed that there are no seats left as the bus passes have sold out. She said it is "odd that they still take people every day and are charging them. In my head if there's no bus passes left then there's no room left."
She added that the NAT Group bus is the only option available for her daughter to get to school.
A spokesman for NAT Group said:
We have been made aware via Cardiff Council and the school concerned of serious allegations relating to the 813 school bus service. The company policy is such that doors should always be closed when the bus is moving. We have experienced a lot of problems recently with students opening doors from the outside by using the emergency buttons. However, the driver should deal with this by quickly closing them again. There is no reason for a bus to be driven with the doors open, and any suggestion of that being the case would result in a formal investigation. The 813 is operated by a double deck vehicle and a defined number of standees is permissible. Where the sale of annual tickets is concerned...we do not sell every available seat on services where cash fares are available too.