Lancaster Mennonite Superintendent Pam Tieszen said that student is in critical condition. The escort vehicle was pushed into the oncoming lane and sideswiped the bus, causing the bus to impact one tractor-trailer's load and tip onto its side, prosecutors said.
The bus was transporting students 7 to 18 years old from Chester County. All other injuries were considered minor, a hospital spokesperson said, and five students have since been released.
Police said a driver in a sedan hit the back of an escort vehicle in East Lampeter Township. Anyone with information about the driver or the vehicle, which should have front-bumper damage, is asked to call East Lampeter police at 717-291-4676. The vehicle then fled the scene, leaving at least 16 people - including the 14 children, the bus driver and the escort vehicle driver - to be taken to a nearby hospital.
The driver is not in custody, Lancaster County District Attorney's Office spokesman Brett Hambright said Thursday.
Another student, a 16-year-old, is expected to be released from at a children's hospital in DE later in the day.
The incident happened just before 8 a.m.at Lincoln Highway East (Route 30) and Route 896 in East Lampeter Township, LancasterOnline reported.More news: It's time for President Trump and James Comey to come clean
Police are looking for the missing driver who "essentially set this crash into motion", Hambright said.
On Thursday investigators released photograph's and video of the suspect's vehicle, which appears to be a light-colored sedan, possibly a white Chevrolet Malibu.
"We want to have a conversation with this driver", Hambright said.
The Lancaster Mennonite School said in a statement on Facebook this morning, "Thank you for your prayers as our school community continues to heal, physically and emotionally, from Wednesday's bus accident".
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"School is operating normally, although prayer and support will be infused throughout the day". "We express concern for the two who are still in the hospital".