A postmortem examination of a Pakistani woman killed for marrying the man she loved has established she was five months pregnant.

Farzana Iqbal, 25, was stoned to death by her family outside one of Pakistan's top courts in the city of Lahore on Tuesday in a so-called "honour" killing.

Honour killings are common in Pakistan, where women are often denied their basic rights. But the brutality of this case caused outrage around the world.

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Many Pakistani families think it dishonourable for a woman to fall in love and choose her own husband.

Police said the woman's father, two brothers and a former fiance were among the attackers. She suffered severe head injuries when they surrounded her and threw bricks at her, and was pronounced dead in hospital. All of the suspects except her father escaped.

Mrs Iqbal had been engaged to her cousin but married another man.

Her family had registered a kidnapping case against him and she had come to court to argue that she had married of her own free will.