The London man accused of killing four members of a Muslim family and injuring a fifth after mounting a sidewalk with a vehicle is facing terrorism charges.

Nathaniel Veltman, 20, was charged by the London Police Service with four counts of first-degree murder, one count of attempted murder and terrorism offences.

"The London Police Service worked in conjunction with RCMP INSET, the Ministry of the Attorney General (MAG) and the Public Prosecution Service of Canada (PPSC), determining that the murders constitute terrorist activity,'' police wrote in a press release on Monday.

"As a result, the Federal and Provincial Attorneys General provided their consent to commence terrorism proceedings, alleging that the murders and the attempted murder also constitute terrorist activity," it added.

Police say Veltman targeted the Afzaal family because of their Islamic faith.