Emergency crews have descended on the M48 after reports a man was seen in the Severn Estuary.
A lane on the motorway was closed for almost an hour while Avon and Somerset Police officers investigated.
Now a police helicopter and the coastguards are searching the area.
A force spokesperson said: “At 1.47pm today (22 July) we received a report a man had entered the Severn Estuary.
“HM Coastguard and the police helicopter are currently carrying out a search of the area.”
Traffic has returned to normal on the M48 and all lanes have reopened.
If you are concerned about someone, or need help yourself, please contact the Samaritans on 116 123 day or night or PAPYRUS on 08000 684141.
