A man has now been arrested in connection with a triple stabbing near to Watford FC’s stadium.
The 36 year old from London has been arrested on suspicion of attempted murder and two offences of GBH.
Three people were stabbed in the early hours of Wednesday morning in Vicarage Road.
A man in his 40s, another man in his 30s and a woman in her 30s. All are still being treated in hospital.
He remains in police custody at this time.
Witnesses to the incident, or anyone else with information, are asked to contact Hertfordshire Constabulary via 101, quoting reference ISR 49 of July 3.