A school in Liverpool has been put in lockdown with police on the scene and parents urged to stay away. The incident is unfolding at Childwall Sports and Science Academy with a letter to parents saying the lockdown is in place as a "precautionary" measure to ensure the safety of students and staff. The letter advised parents to not attend the school as staff are focusing on the situation. It said it will provide further updates as soon as it's safe to do so. Merseyside Police say a threat has