The 2nd person arrested wasn't a passenger.
WHAT WE KNOW:
Victoria Police have arrested the sole occupant of the car, 32-year-old Saeed Noori, who is of Afghan descent and has a history of drug use and mental illness.
A second man who was filming the incident was arrested. He had three knives in his bag.
Police have not established a relationship between the two men who were arrested.
Two men are in custody and are being questioned by police.
Police have emphasised there is no evidence to connect the incident with terrorism.
Premier Daniel Andrews says there is no intel to suggest we need to change our current threat level or threat assessment.
A white SUV collided with pedestrians on Flinders St just after 4.30pm.
Police say 19 people were injured during the incident, 15 of them are stable and four are in a critical condition. Nine patients been taken to The Alfred hospital. Three have been taken to the Royal Melbourne Hospital. A child with a head injury has been taken to Royal Children’s Hospital and is in a stable condition. More patients are at St Vincent’s.
Buildings fronting on to Flinders St were evacuated.
All pedestrians and vehicles are advised to avoid the area.
http://www.heraldsun.com.au/news/victoria/flinders-street-incident-what-we-know-so-far/news-story/16691d32a3d43d8341a389ead7567086