A British woman is facing two years in jail in Dubai for calling her ex-husband's new wife a "horse" on Facebook, campaigners have said.
Londoner Laleh Shahravesh, 55, was arrested at a Dubai airport after flying there to attend her former husband's funeral.
She faces prosecution over two Facebook comments she posted on pictures of her husband remarrying in 2016.
The Foreign Office said it was supporting the mother-of-one.
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Ms Shahravesh was married to her ex-husband for 18 years, during which time she lived in the United Arab Emirates for eight months, according to the campaign group Detained in Dubai.
While she returned to the UK with her daughter, her husband stayed in the United Arab Emirates, and the couple got divorced.
Ms Shahravesh discovered her ex-husband was remarrying when she saw photos of the new couple on Facebook.
She posted two comments in Farsi, including one that said: "I hope you go under the ground you idiot. Damn you. You left me for this horse".
Under the UAE's cyber-crime laws, a person can be jailed or fined for making defamatory statements on social media.