Ottawa police say they have made an arrest after a minivan struck and seriously injured five cyclists. At least two of the cyclists are listed in critical condition.

Investigators say they have located the minivan involved in the incident.

The driver was not present at the scene when paramedics arrived Sunday morning and found most -- or all -- of the cyclists unconscious, at an intersection in the Ottawa suburb of Kanata.

A suspect turned himself in to police about two hours later.

"That male has since been arrested. He attended with his wife. We've since located the crime vehicle and seized it for forensic identification," said Acting Insp. John Maxwell.

A bystander called 911 at 7:52 a.m. to report the incident, Darryl Wilton, Ottawa Paramedics superintendent of operations, told CTV.ca.

According to Wilton, the first paramedic unit to arrive found the group suffering from a number of traumatic injuries:

• A woman, believed to be in her 30s, who was found unconscious and in pre-cardiac arrest. According to Wilton, the woman sustained "significant" brain injuries, as well as a fractured ankle. She was treated by an advanced life support paramedic unit before being taken to hospital, where she is listed in critical condition.
• A 27-year-old female, who was also unconscious when paramedics arrived but regained consciousness with treatment. She suffered a closed head injury, as well as hip and upper leg fractures. She was flown from the scene in an air ambulance and is in serious condition in hospital.
• A 36-year-old male, who was found unconscious with a closed head injury and severe scalp lacerations. He is in critical condition.
• A 39-year-old male who sustained a concussion and a minor leg injury. He is in serious condition.
• A 45-year-old female, who also has a concussion, in addition to a fractured left arm and elbow. She is also in serious condition.

It appears the victims were travelling together in a dedicated cycling lane at the time they were struck. According to Wilton, the distance between the point of impact and the patient farthest away was 120 metres.

Wilton said two paramedic supervisors on the scene told him that victims appeared to be dedicated cyclists, as they all had top-of-the-line equipment.

The cyclists were on their way to meet a woman, who identified herself to officials at the scene as a physician.

"When they didn't show up on time she was waiting and then when she saw the helicopter landing she thought, 'Oh no,'" Wilton said. "So she came to the scene."