3 Dead, 14 Injured After Greyhound Bus Crash on Illinois Highway Exit Ramp

"Our primary concern is ensuring we care for our passengers and driver at this time," Greyhound said in a statement

Christian Gooden/St. Louis Post-Dispatch via AP

Three people were killed and at least 14 were injured, some seriously, when a Greyhound passenger bus struck three other vehicles early Wednesday in southern Illinois, state police said.

"Initial investigation indicates a Greyhound passenger bus with passengers was traveling westbound on Interstate 70 and struck three commercial motor vehicles parked on the exit ramp to the Silver Lake Interstate 70 westbound rest area," the agency said in a news release.

Related: Child Among 29 Dead in Mexico Bus Crash, Official Says Cause Appears to Be 'Lack of Skill and Tiredness'

The three tractor-trailers were parked along the right shoulder of the long entrance ramp leading to the rest area, State Police Trooper Josh Korando told the St. Louis Post-Dispatch. The truckers had pulled off the highway to sleep.

According to state police, four people were taken to the hospital by helicopter after the crash shortly before 2 a.m., while at least ten others were transported by ambulance.

Christian Gooden/St. Louis Post-Dispatch via AP

Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from celebrity news to compelling human interest stories.

Edward Alexander, a bus passenger, told the Post-Dispatch that the crash sent him sliding down the aisle and that his nose was badly bleeding. According to the report, he helped a woman exit through a bus window after she complained of trouble breathing.

No one was injured in the other vehicles, which were tractor-trailers, according to the Associated Press, CBS News and the Post-Dispatch.

Related: 32 People Hospitalized After Double-Decker and City Bus Collide in Manhattan

State Police spokesperson Melaney Arnold told the AP that those killed and injured were all on the Greyhound bus, but it wasn't clear if the bus driver was among those killed or injured or if all of those involved were passengers.

"Our primary concern is ensuring we care for our passengers and driver at this time," Greyhound told CBS News and the Post-Dispatch. The company said that the bus had 30 passengers onboard, including the driver, and was traveling from Indianapolis to St. Louis.

Greyhound sent another bus to pick up passengers who were not injured, according to the paper.

Authorities have not released any information about the people who were killed.

For more People news, make sure to sign up for our newsletter!

Read the original article on People.