An air ambulance was sent to Stopsley yesterday evening after a man in his 30s reportedly suffered a heart attack.
Emergency crews were alerted just after 5pm after a man collapsed in Co-op on Hitchin Road.
Two response cars and an ambulance were sent, as well as an air ambulance which landed at Cardinal Newman School.
The man, who is in his 30s, was taken by ambulance to Lister Hospital in Stevenage escorted by a doctor from the air ambulance.
His condition was said to be life threatening.