Humberside Police thanked everyone who had offered or assisted in the search.
Vickers added: “Our thoughts and sincere sympathies will always remain with the families of Grace and Sarah Keeling, and Mark Ratcliffe following this utter tragedy.”
Police had previously said that, from trawling through CCTV and speaking to multiple witnesses, it was understood that Grace Keeling and a friend were on the steps near to the rocks when she was “believed to have fallen into the water after being swept by a wave”.
A major operation was launched at 15:10 GMT on Friday 2 January following reports of people in the water. It involved HM Coastguard, emergency services, the RNLI and included helicopters and lifeboats.
Ratcliffe, from Withernsea, was pulled unconscious from the sea and died at the scene.
The body of Sarah Keeling, from Sutton-in-Ashfield, Nottinghamshire, was recovered later the same evening.