A bomb squad was called in; they blew up a duffle bag found in the suspects' van.
Authorities were looking for explosives because of the bomb threat called into the bank targeted by the robbers.
At one point during the robbery, chase and crash, streets in one suburb and a section of highway in another were shut down.
The police drama started Thursday morning around 10 a.m. at a bank in South Holland and ended with the crash at the intersection of Sauk Trail and Route 394 near Sauk Village.
A South Holland Bank robbery and apparent police chase ended on I-394 near Sauk Trail Road in Sauk Trail.
Federal authorities say they caught two suspects.
The multi-car pile up involved the suspect's red vehicle, a luxury RV, and two south suburban police cars.
Both cop cars appeared damaged. The entire front end of one vehicle was smashed and authorities say the Sauk Village officer was injured during the crash.
A passenger in the suspect's red vehicle was also injured.
Police do not believe the injuries are life threatening.
It all started around 10 on Thursday morning. The FBI reports that someone called in a bomb threat to First National Bank.
Shortly thereafter, a lone robber attempted to rob the bank - essentially shutting down 162nd, one of the major thoroughfares through South Holland.
"My employees called me on the phone because across the street from my shop. They had just robbed the bank," said Rafoo Johnson, auto shop owner.
FBI officials say the robber disarmed a security guard and held some of the bank employees hostage. The robber brought his own bag and demanded that it be filled with cash.
After that, the feds say he took off in vehicle that was waiting outside the bank and that's when the high-speed chase started.
Several blocks in South Holland were shut down throughout the morning and afternoon.
"It's difficult because we have vendors who have parts...we have customers who have been sitting waiting to leave but nobody can leave or do anything this time," said Johnson.
"They should definitely put out information of what's going on. We live out here too. We want to know what's going on in our community too," said Shakayshia Perry, auto Shop customer.
Back at the crash scene late Thursday afternoon a bomb squad suited up to detonate an object. At this point, it's unclear what they discovered and destroyed at that scene.
The two suspects are expected to be charged on Friday.