A driver plowed a pickup truck into a family of five, killing four of them and seriously injuring the other in a deliberate attack that targeted the victims because they were Muslims, Canadian police said Monday. Authorities said a young man was arrested in the parking lot of a nearby mall after the incident Sunday night in the Ontario city of London. Police said a black pickup truck mounted a curb and struck the victims at an intersection. “This was an act of mass murder perpetuated against Muslims,” Mayor Ed Holder said. “It was rooted in unspeakable hatred.” Read: Canada lowers flags after discovery of bodies at school site The extended family issued a statement identifying the dead as Salman Afzal, 46; his wife Madiha, 44; their daughter Yumna, 15; and a 74-year-old grandmother whose name was withheld. The hospitalized boy was identified as Fayez. “Everyone who knew Salman and the rest of the Afzal family know the model family they were as Muslims, Canadians and Pakistanis,” the statement said. “They worked extremely hard in their fields and excelled. Their children were top students in their school and connected strongly with spiritual their identity.” A fundraising webpage said the father was a physiotherapist and cricket enthusiast and his wife was working on a PhD in civil engineering at Western University in London. Their daughter was finishing ninth grade, and the grandmother was a “pillar” of the family, the page said. The family said in its statement that the public needs to stand against hate and Islamophobia. “This young man who committed this act of terror was influenced by a group that he associated with, and the rest of the community must take a strong stand against this, from the highest levels in our government to every member of the community,” the statement said. Nathaniel Veltman, 20, was in custody facing four counts of first-degree murder. Police said Veltman, a resident of London, did not know the victims. Detective Supt. Paul Waight said police had not determined if the suspect was a member of any specific hate group. He said London police were working with federal police and prosecutors to see about potential terrorism charges. He declined to detail evidence pointing to a possible hate crime, but said the attack was planned. Read:More than 200 bodies found at Indigenous school in Canada About a dozen police officers combed the area around the crash site looking for evidence Monday. Blue markers on the ground dotted the intersection. “We believe the victims were targeted because of their Islamic faith,” Police Chief Stephen Williams said. “... There is no tolerance in this community who are motivated by hate target others with violence.”