Sydney knifeman, 40, had mental health issues since his teens, say family

Joel Cauchi, from Queensland, had been known to police, particularly over the last five years, but had not been arrested or charged before he committed the attack on Saturday

Police officers walk past a sign at Westfield Shopping Centre, where multiple people were stabbed in Sydney on Saturday (Rick Rycroft/PA)

The Sydney knife attacker who killed six people at a shopping centre had suffered mental health issues since he was a teenager, his family said.

Joel Cauchi, 40, from Queensland, had been known to police, particularly over the last five years, but had not been arrested or charged before he committed the attack on Saturday.