On Monday 22nd May 2017, Ariana Grande played what was expected to be another gig at Manchester Arena.
Many people from around the country, including Hartlepool, travelled to the city to see the popular singer.
Louise and Emily Anderson (pictured below) were in the Arena when the explosion happened.
Thankfully they were not injured but Lee Theasby spoke to Louise about their experiences during the terrifying attack.
There is a helpline number for people who are worried about family or friends who might be caught up
0161 856 9400