Prosecutors on Sunday made another attempt at winning an arrest warrant for the daughter of ex-President Park Geun-hye's confidante Choi Soon-sil.

Prosecutors earlier this month sought an arrest warrant for Chung Yoo-ra, who is thought to have been a major beneficiary of her mother and Park's extortion racket.

But they only sought the warrant over charges to do with Choi wrangling illegal favors for her daughter from the prestigious Ewha Womans University. The court said there was insufficient evidence that Chung herself played a major role in her admission or that the charge is serious enough to keep Chung in jail for.

But this time prosecutors have brought out bigger guns, adding charges of concealing criminal proceeds. A prosecution spokesman said investigators discovered "fresh and significant" evidence that Chung hid W7.8 billion in alleged bribes from Samsung masked as support for her equestrian training (US$1=W1,135).

Chung allegedly bought pure-bred with the money but sold them in a rush when the scandal surrounding Park and her mother blew up last year. Prosecutors have already questioned the groom of Chung's horse and the nanny of her infant son, focusing on how the slush fund was spent.

Chung has pleaded ignorance of all charges.

