Nearly half of the passengers hospitalized following the tour bus accident on on the Coquihalla Highway have been released.

Three passengers were still in critical condition in hospital on Saturday down from seven on Friday.

According to a release from Interior Health, a total of 22 people injured in the crash are still in Royal Inland Hospital in Kamloops, and at Kelowna General Hospital. Two other patients remain in serious condition while 17 others have non-life threatening injuries.

All 56 bus passengers were injured in the crash and 43 passengers were taken to hospital following the crash that happened 20 kilometres southwest of Merritt on Thursday.

Investigators said the bus hit a median while travelling southbound before it skidded across several lanes of traffic, then rolled into a ditch ejecting several passengers from the vehicle.

The bus passengers were from Canada, mainland  China, Hong Kong, Taiwan and the United States. The bus was being used by Richmond-based company Super Vacation Canada for a tour in the Rocky Mountains. It was chartered through another company, Western Bus Lines, based in Kelowna.

An investigation into the cause of the crash is ongoing. Investigators do not believe speed was a factor.

A 24-hour toll free hotline has been set up for family members of the patients with both English and Mandarin-speaking operators. The number is 1-888-350-6070.