Rescue crews are searching a stretch of coastline after a man was swept into the sea in gale-force winds.
The 41-year-old was reported to have been walking his dog in Blackpool with another man when both men ended up in the water shortly after midnight.
The second man was able to get to safety and raise the alarm.
A search was carried out overnight by RNLI and Coastguard crews from Blackpool and Lytham St Annes, assisted by the Lancashire Police helicopter and the search and rescue helicopter from RAF Valley on Anglesey.
A second search operation got under way just after first light today and remains ongoing.