3 toddlers among dead in Australia's mass killing

Five bodies were found dead at an Australian suburban home and three of them were pre-school girls.
The multiple killing which has shocked the country was confirmed by authorities on Monday.
Police found the remains of the toddlers, as well as those of their mother and grandmother at a detached family home near the south-western city of Perth. The discovery came after a man, aged in his 20s, visited a regional police station earlier Sunday, investigators said.
Western Australia police said Monday the "five people killed were twin two-year-old girls, a three and a half-year-old girl, their mother and grandmother".
"The man currently assisting police remains in custody, no charges have been laid at this time."
No further details about when and how they were killed, or the family's relationship with the man, were