London: Pakistani Nobel Prize laureate Malala Yousafzai has condemned the killing of female human rights activist, Sabeen Mahmud in Karachi and demanded the earliest arrest of the assailants.

In a statement Malala praised Mahmud, saying that she was a brave human rights activist and her murder saddened her. Malala also prayed for speedy recovery of Mahmud's mother, who was injured in the armed attack.

Mahmud, who founded the social forum T2F, was shot dead on Friday night minutes after the end of an interactive discussion on "Unsilencing Balochistan". According to reports, motorcycle-riding assailants attacked Mahmud and her mother after they had left the T2F in a car. The Inter Service Public Relations (ISPR) Director General on Saturday tasked the intelligence agencies to assist in the investigation of the killing.