Post mortems will be carried out next week to establish the causes of death, police said.
Advertisement
Detective Sergeant Andy Roper, of the Serious Collision Investigation Unit, said: “The families of Stephen and Jessica are being supported by specially trained officers.”
He appealed for witnesses, adding: “We also urge those who were driving near the incident to check your dashcam footage. Any information no matter how small could help the investigation.”
Four children were taken to hospital and a 14-year-old boy is said to have sustained life-changing injuries.
Other pupils were taken to an emergency services training centre in Wallasey, with 13 treated for minor injuries.
Police said 58 people were involved in the crash.
The bus had been carrying pupils from two Merseyside schools – Calday Grange all-boys grammar school and West Kirby all-girls grammar school.
Please use Chrome browser for a more accessible video player
0:44
Aerial footage shows scene of crash
Police said there were more children on other buses travelling in convoy with the one that crashed.
All those involved will be offered trauma support and family liaison officers are supporting relatives.