What we know about the accused in the fatal attack on a Muslim family in London, Ont.

The man facing murder charges after a truck jumped a London, Ont., curb and ran into a Muslim family of five, killing four of them, has left no traces on social media about his life. But a neighbour who spoke to CBC News said while the 20-year-old tended to keep to himself, he'd have frequent visitors at his apartment and there was constant noise.