Chilling moment masked man paces outside Southport home minutes before mass stabbing
![Chilling moment masked man paces outside Southport home minutes before mass stabbing](https://i2-prod.mirror.co.uk/incoming/article33354481.ece/ALTERNATES/s615/1_Southport-house-CCTV.jpg)
Six children and two adults remain in critical condition as Merseyside Police continue to question a 17-year-old boy, originally from Cardiff, over a deadly knife attack in Southport