Pakistani human rights activist fatally shot in southern city of Karachi

In this picture taken Friday, April 24, 2015, Pakistani police officers examine the damaged car of a prominent women's rights activist Sabeen Mehmud following an attack on Mehmud in Karachi, Pakistan Friday, April 24, 2015. Police in Pakistan say gunmen have killed the prominent women's rights activist in the hours after she held a forum about the country's restive Baluchistan region. Senior police officer Zafar Iqbal says gunmen attacked Sabeen Mehmud on Friday night as she returned to her Karachi home with her mother, who was wounded in the assault. (AP Photo/Shakil Adil) (The Associated Press)

In this picture taken Friday, April 24, 2015, a Pakistani cameraman films the damaged car of a prominent women's rights activist Sabeen Mehmud following an attack on Mehmud in Karachi, Pakistan Friday, April 24, 2015. Police in Pakistan say gunmen have killed the prominent women's rights activist in the hours after she held a forum about the country's restive Baluchistan region. Senior police officer Zafar Iqbal says gunmen attacked Sabeen Mehmud on Friday night as she returned to her Karachi home with her mother, who was wounded in the assault. (AP Photo/Shakil Adil) (The Associated Press)

People carry the casket of a prominent women's rights activist Sabeen Mahmud, who was killed by unknown gunmen during a funeral in Karachi, Pakistan on Saturday, April 25, 2015. Police in Pakistan say gunmen have killed the prominent women's rights activist in the hours after she held a forum about the country's restive Baluchistan region. Senior police officer Zafar Iqbal says gunmen attacked Mahmud on Friday night as she returned to her Karachi home with her mother, who was wounded in the assault. (AP Photo/Fareed Khan) (The Associated Press)

Police say gunmen have killed a prominent Pakistani women's rights activist in the southern city of Karachi.

Senior police officer Zafar Iqbal says Sabeen Mehmud was attacked Friday night as she was returning home with her mother, who was wounded.

In a statement, Prime Minister Nawaz Sharif condemned Mehmud's assassination and ordered an investigation.

No one has claimed responsibility, but the killing comes shortly after Mehmud organized a seminar about Baluchi nationalists who often disappear in the country's impoverished southwestern Baluchistan province. Pakistani rights activists blame security agencies.

Mehmud was the director of the organization "Second Floor," which includes activists, writers and intellectuals.