Malala Yousufzai and her father Ziauddin have become the first signatories of a petition calling for better protection for teachers and students in Pakistan.
The petition, addressed to the president of Pakistan, is in response to the killing of a teacher on her way to work at a girls' school in Pakistan's north-west tribal region on Tuesday.
The killing took place not far from where Malala herself was shot in the head as she returned from school in October 2012.
More top news
Parts of the UK will feel colder than the Arctic Circle in the coming week as bitter winds make it feel -15C in some places.
At least three people have been killed in clashes in eastern Ghouta just hours after the UN Security Council backed a 30-day ceasefire.
Very Very Cold !