Zayn Malik's sister, Safaa, posted a photo of her family's Christmas tree on Instagram on Thursday.
That photo sparked death threats and claims that she was a "disgrace to the faith," according to Metro.
Zayn and Safaa's family blends Christian and Muslim traditions; their father is Muslim while their mother is Christian. Zayn, most famous for his time in One Direction, identifies as Muslim.
Here's the photo that reportedly sparked threats.
The post appears to have its comments disabled. Instagram recently allowed all users to disable comments on their posts in an attempt to deter harassment.
"The hate that Safaa received was just disgusting," a source told the British tabloid the Daily Star.
Some Twitter users criticized the Islamic faith for the reaction.