Police have resumed their search this morning for a man thought to be missing in the Tweed River.

Police from the Tweed/Byron Local Area Command, together with Coffs Harbour Water Police, police divers from Sydney and members of local Surf Life Saving Clubs, will continue searching around the Chinderah Bay Drive area of the river for a 35-year-old man, Sean Staunton, of Chinderah.

Shortly before 3pm on Thursday, a child was found about 100 metres from a boat ramp off Chinderah Bay Drive by a passer-by.

The boy was taken to Tweed Heads District Hospital in a critical condition and was later transferred to Brisbane Hospital.

He has regained consciousness and remains in a serious condition.

A car and boat trailer were later located in the carpark and subsequent inquiries linked the vehicle to the father of the child.

Two men who were finishing off the rocks at Oxley Cove about 7pm on Thursday (3 June) evening have been interviewed by police.

Police have been told that the two men saw the dingy submerged in water before dragging the vessel to the shore.

The search continues.