Two alleged gunmen who killed 15 people at a Jewish celebration at Sydney's Bondi Beach were a father and son, police said on Monday, as Australia began mourning victims of its worst gun violence in almost 30 years, Reuters reported. 

The father, a 50-year-old, was killed at the scene, taking the number of dead to 16, while his 24-year-old son was in a critical condition in hospital, police said at a press conference on Monday. Officials have described Sunday's shooting as a targeted antisemitic attack.

Forty people remain in hospital following the attack, including two police officers who are in a serious but stable condition, police said. The victims were aged between 10 and 87, according to Reuters.