According to The Jerusalem Post,

The Society for Defending Women's Rights in Saudi Arabia said the religious police arrested the two sisters, aged 19 and 21, thus putting their lives in danger.

Their brother shot them to death in front of their father when they left a women's shelter in Riyadh on July 5, according to Saudi news reports.

I have wasted lot of words on the way women are treated in Saudi Arabia. I say wasted because nothing ever changes there. It is the same, over and over again. Today there is this shameful killing, and tomorrow another woman will be held in her home and not allowed to pursue her goals, and the tale of Saudi women held hostage by the regime and culture goes on.

A ray of hope I found online: read this article and you will understand why. It is at Saudi Gazette. 

Bhumika Ghimire