One day after a rollover on Highway 401 sent a 4-year-old girl to the hospital in life-threatening condition, Ontario police have provided an update on the case and they are also appealing for witnesses to come forward. Meanwhile, the young girl remains in a Toronto trauma center, fighting for her life.\nIn a video shared to his Twitter, Sgt Kerry Schmidt was back at the scene of the tragic collision, which happened on the 401 near Winston Churchill in Mississauga around 2:30 yesterday. In his update, he said that the crash in the middle lane and far left lane when an SUV clipped the back corner of a transport truck that was moving slower. The vehicle then rolled over eventually landing on its roof on the shoulder. In that time the 4-year-old girl was ejected from the vehicle.\nSchmidt also provides an update on the girl's condition, saying, "Sadly, unfortunately, we still have a little girl that's fighting for her life. She remains in the hospital right now in a critical, life-threatening condition in a downtown trauma center."\nMeanwhile, he reveals that the 2-year-old girl who was also in the car has been released from the hospital and is uninjured. Schmidt also says that the driver, who is 25 years old and the mother of the two girls, has also been released from the hospital, however, the family remains there with the 4-year-old.\n4 year old child ejected and sustained life threatening injuries after rollover collision on #Hwy401 EB approaching Erin Mills Pkwy #Mississauga. 2 year child uninjured, driver of SUV minor injuries, truck driver uninjured.Hwy401 EB closed at Winston Churchill for investigation pic.twitter.com/DmJuER6zwT— Sgt Kerry Schmidt (@OPP_HSD) May 23, 2019\nAs for what exactly caused the crash or caused the young girl to be thrown from the vehicle, the OPP need some help from the public. In his video, Schmidt says they are appealing for witnesses who were in the area yesterday and have dash cam video to come forward.\nSchmidt reveals that there are no traffic cameras along this stretch of the 401 so anyone with dash cam footage that shows the collision or even footage around that time to help investigators get an idea of traffic patterns and traffic flows is asked to call the Port Credit OPP at 905-278-6131.\nUpdate on serious rollover collision #Hwy401 EB Winston Churchill from May23rd https://t.co/I5D0yk5Swh— Sgt Kerry Schmidt (@OPP_HSD) May 24, 2019\nIt's unclear if the police are currently looking at pursuing any charges in this case, but Schmidt reveals that since the child was ejected from the vehicle, resulting in serious injuries, investigators will be looking at whether proper "occupant restraints" were being used at the time of the crash.