The Great North Air Ambulance Service has issued a statement on social media following their callout to the tragic event in Southport yesterday (July 29). 

Three children, aged 6,7 and 9, have now died after a knife attack at a Taylor Swift dance class in the Merseyside town.

Five children and two adults remain in critical condition in hospitals across Liverpool and Manchester.

The Langwathby-based air ambulance service was among those called to the scene for a mission they described as 'particularly difficult'.

In a post on social media, a GNAAS spokesperson said: "As many of you may already know, yesterday, our critical care team responded to an incident in Southport.

"On behalf of us all, we send our heartfelt condolences to the children and families affected by this attack. 

READ MORE: Three girls killed in Southport knife attack named as families pay tribute

"Whilst many of the call-outs we attend are harrowing, this mission was particularly difficult for our doctor, paramedic, pilot, and other team members involved in the response. 

"We'd like to say a huge thank you for the kind comments left on our incident update post yesterday, we will be sure to pass on your kind words to the crew." 

According to the life-saving charity, responders, alongside North West Air Ambulance and Midlands Air Ambulance Charity, 'delivered advanced emergency care to one patient before accompanying them to hospital by road' following the knife attack. 

Social media has been filled with messages of support and condolences for those affected, with many praising the work of the GNAAS team.

A 17-year-old has been arrested in connection with the incident, but police have said that, although the motive for the attack is unclear, it is not believed to be terror-related.