Police have closed the A13 at Benfleet to carry out searches in connection with an incident in which two men were stabbed.
Detectives have appealed for witnesses following a series of assaults between Kiln Road and Benfleet Road at about 12.45am today, December 27.
Two men from east London received stab wounds and one is still in a serious condition in hospital. The second man was allowed home after treatment.
A man and a woman, both in their 30s and a teenage boy, all from Benfleet, were arrested in connection with the assaults and remain in custody this morning.
Police have advised drivers to seek alternative routes around the central Benfleet area until investigations are completed.
Any witnesses or anyone with information should contact detectives at Rayleigh on 101 or call Crimestoppers anonymously on 0800 555111.