Police were called to McDonalds, in Watford High Street, at 2.01pm today after receiving reports of a physical altercation between three men.
Ambulance crew took the man to an Ambulance waiting at the top of the town by the Library.
From there it is believed he was taken to Watford General Hospital.
The two suspects are described as young black teens both, aged around 15 years old and of a skinny build.
Police believe this is an isolated incident and not terror related.
Police would like anyone who saw the incident can contact Hertfordshire Constabulary via the non-emergency number 101 quoting ISR 372.
Alternatively, you can contact the independent crime-fighting charity Crimestoppers anonymously on 0800 555 111 or through their Anonymous Online Form at www.crimestoppers-uk.org. No personal details are taken, information cannot be traced or recorded and you will never need to go to court.
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