TWO people are believed to have died in a crash on the M271, near junction 1.
Both carriageways were closed earlier this evening because of the incident in which two other people are thought to be seriously injured.
Firefighters from Cosham station were called to the crash alongside other crews from Redbridge, St Marys and Totton.
The southbound carriageway remains closed and is expected to for the rest of the night. Police are advising motorists to avoid the area.