The rape and murder of Zainab, a six-year-old girl from Pakistan, has sparked an outpouring of rage and grief online.
While the story has triggered angry demonstrations on the streets, more than half a million social media users have rallied around the hashtag #JusticeForZainab to call for action to be taken by the authorities, and to discuss the wider problem of sexual assault and the murder of children.
The body of the young girl was found in a rubbish dump in the city of Kasur, in the Punjab province, several days after her disappearance.
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At time of writing, #JusticeForZainab has been used over 600,000 times on Twitter since 9 January and variations of the hashtag have been used more than 30,000 times on public Instagram posts in the same period.
The hashtag began trending around the world as the news of the attack came to light, and received more attention after two protesters were killed by police.
While much of the reaction expresses horror and sadness, the origins of the hashtag seem to be political.
#JusticeForZainab was first used by activists for the opposition party Pakistan Awami Tehreek (PAT). The party is fiercely opposed to the ruling Pakistan Muslim League who control the Punjab province.
PAT campaigner @AtiqRehmanPAT was among the first to tweet the hashtag at 16:33 GMT on 9 January, saying the girl was "brutally abused and then silenced forever."
قصور کے محترم محمد امین انصاری صاحب کی ننھی بیٹی 7 سالہ زینب کو نامعلوم افراد نے درندگی کا شکار بنا کر ابدی نیند سلا دیا گیا۔7سالہ زینب کو 4 روز قبل گھر کے باہر سے اغوا کیا گیا تھا اور زیادتی کے بعد گلا دباکر ہلاک کردیا گیا#JusticeForZainab@SajidBhattiPAT @AnjumKiani pic.twitter.com/FdY0x9bf2w— Atiq ur Rehman (@AtiqRehmanPAT) January 9, 2018
The hashtag has since been used by many political activists to deride the perceived failings of the local authorities, given the spate of abductions, sexual assaults and killings in the area, which have included 12 similar murders in the past two years.
Some used the hashtag to highlight other cases of sexual assault and murder against young children that have not received the same level of attention.
#JusticeForZainab— Jawad Ahmad (@jawadibf) January 11, 2018
What the Hell is Going On?
Raped and Murdered in the past 6 months
Emaan Fatima 4.5 years old
Fouzia 11 years old
Noor Fatima 5.5 years old
Ayesha Asif 5 years old
Laiba 9 years old
Sana Umar 7 years old
Kainaat Batool 5 years old
and now Zainab 7 years old
Zainab's parents have been willing to engage with the media and the growth of the hashtag has been propelled by well-known figures posting about Zainab.
Analysis: Secunder Kermani in Kasur, Pakistan
There's still a lot of anger in Kasur. Protesters today ransacked the offices of a local politician and hurled stones at the police who fired tear gas in return - all just metres away from the rubbish dump where Zainab's body was discovered.
Zainab's father has received a steady stream of politicians at his home, promising he will receive justice.
He says he believes the killer will now be caught, but is angry with the police. He believes they didn't take the case seriously enough when his daughter first went missing.
Another father in Kasur, Asif Baba, shares his pain. His five-year-old daughter Ayesha disappeared in January last year. She too was murdered. Asif believes the same man who killed Zainab was responsible and he too blames the police for not investigating the killings properly.
Asif has kept his daughter's school uniform and doll collection in the room he shared with her. His eyes fill with tears as he shows them to me. He says when he heard about Zainab's murder he felt like he had lost his daughter all over again.
A number of Pakistani celebrities expressed their sadness over the incident, including professional cricketer Shadab Khan who said, "Zainab's tragedy is humanity's tragedy."
My heart goes out to Zainab and her family. It is important to address these issues and bring the people responsible to justice. We must stand united as society against such barbaric crimes. #JusticeForZainab— Shadab Khan (@76Shadabkhan) January 10, 2018
The story has made an impact around the world, with social media users in various countries discussing the death of Zainab.
Heartbroken to hear about Zainab - a 7 year old child abused and brutally killed in Kasur, Pakistan. This has to stop. Gov and the concerned authorities must take action. #JusticeForZainab— Malala (@Malala) January 10, 2018
The hashtag has also started conversations around the role of gender in Pakistan. Karachi-based journalist Faizan Lakhani suggested people reflect on the upbringing of young boys.
We always talk about upbringing and protection of our daughters, may be it’s time for us to stress on raising our sons right too. The Kasur incident is reflection of our failure as society. #JusticeForZainab— Faizan Lakhani (@faizanlakhani) January 9, 2018
The Muslim Women's Network, based in the UK, argued: "To truly achieve a world free from abuse, we need to tackle all forms of patriarchal/misogynist attitudes & promote equality/ justice through positive actions."
Sadly Zainab is one of many victims who have been abused, raped & killed. To truly achieve a world free from abuse, we need to tackle all forms of patriarchal/misogynist attitudes & promote equality/ justice through positive actions (not just through words). #JusticeForZainab— MWNUK (@MuslimWomenUK) January 11, 2018
Many of the posts include a photo of the seven-year-old wearing a pink jacket and sparkly yellow jumper. However, some on Instagram are posting photographs of themselves with tape over their mouths and signs demanding justice for Zainab.