
Farzana Parveen was battered to death last week outside the court by more than two dozen attackers, including numerous relatives, armed with bricks.
"We have arrested two brothers of Farzana, Zahid Ali and Ghulam Ali, and her alleged former husband Mazhar Iqbal in this case," Chaudhry Shafiq, a senior police official, told AFP. "They will be produced before a court tomorrow."
The killing sparked outrage because of its brazen and brutal nature and claims that the police did nothing to save Parveen, who was three months' pregnant.
The US branded the incident "heinous" and Prime Minister Nawaz Sharif demanded immediate action to catch the killers.
With the latest arrests there are 13 in police custody, including Parveen's father Mohammad Azeem.
He was detained at the scene of the attack, and a court last Saturday remanded him in custody for a further seven days.
Parveen's husband Mohammad Iqbal claims more than two dozen people were responsible for her killing.
Police said they would present a detailed report on the killing to the High Court on Thursday.
COMMENTS
Comments are moderated and generally will be posted if they are on-topic and not abusive.
For more information, please see our Comments FAQ