Four women and girl, 13, killed in Vienna in two separate incidents

Three women found with fatal knife wounds in brothel, while bodies of another woman and daughter discovered in apartment

Austrian authorities are investigating the killings of four women and a 13-year-old girl in Vienna within a day, including three found stabbed to death in a brothel.

The bodies of three young women were found with fatal knife wounds in a brothel in the Austrian capital's Brigittenau district on Friday night after a witness alerted police.