KITCHENER -- Police say four people are in custody after they allegedly led officers on a chase through southern Ontario after they stole an undisclosed amount of money from a bank in Cambridge on Wednesday afternoon.

According to Waterloo regional police, the incident happened at the Scotiabank on Hespeler Road at around 3:30 p.m. The suspects entered the bank with a firearm and demanded money from the employees.

They got an undisclosed amount of money before fleeing the area.

After the bank robbery in Cambridge, the OPP says the suspects led officers on a chase into Mississauga. Initial reports said there were multiple people inside the vehicle. There was an increased police presence in the area of Bristol Road West and drivers were asked to avoid the area.

In a tweet, the OPP said the suspects were on Highway 401 from Cambridge on Wednesday afternoon. Officers saw the vehicle and pursued it. An officer suffered minor injuries after a collision between the suspect vehicle and a cruiser.

Police said the vehicle continued into Mississauga, where Peel regional police found it in a residential area. The OPP worked with Peel regional police to take the suspects into custody. By that time, the vehicle had been involved in a second collision in Peel.

Peel regional police said that two people were in custody by around 7 p.m. and two others were arrested shortly after. A total of four people were in custody by around 7:30 p.m. and police said they weren't searching for any other suspects.

On Thursday, the Waterloo Regional Police Service said that two suspects, a man and a youth, had been charged with robbery with a firearm and disguise with intent. They're described as an 18-year-old man from Brampton and a 15-year-old male from Etobicoke. Both have been held for a show-cause.

The other two people arrested, a 21-year-old Burlington man and a 16-year-old Brampton male, were charged with robbery with a firearm. They were both released on an undertaking.

The investigation is ongoing. Anyone with information is asked to contact police.

This was the third bank robbery in Waterloo Region this year.