Explosion closes part of historic city with police and firefighters at scene
![Explosion closes part of historic city with police and firefighters at scene](https://i2-prod.walesonline.co.uk/news/uk-news/article29233810.ece/ALTERNATES/s615/0_01HYN9KW8G62G8QMPMMH1BQ4GF.jpg)
A cordon has been put in place blocking part of the city with people being asked to stay away
A cordon has been put in place blocking part of the city with people being asked to stay away