A mother and her young son who died after being pulled from the sea off Aberdeen beach have been named.

Julie Walker, 37, and her six-year-old son Lucas, from Aberdeen, died in hospital following a major rescue operation on Saturday.

Lucas' brother Samuel, 13, remains in hospital while a 25-year-old woman and 28-year-old man have been discharged following treatment.

Police said the three survivors had entered the water in an attempt to rescue Ms Walker and her son.

Chief superintendent Campbell Thomson said: "This is a very tragic incident and our thoughts are with the Walker family at this sad and difficult time.

"Whilst officers continue to investigate the circumstances of the incident, it is clear heroic attempts were made to save Julie and Lucas by both on and off duty police officers, emergency service personnel and members of the public, facing treacherous sea conditions and high winds during their rescue bid. Their brave efforts cannot be overstated.

"I'd like to pay special tribute to Lucas's brother Samuel, who very bravely entered the water in an attempt to rescue his mother and brother. We are all very thankful Samuel is making a steady recovery in hospital.

"Police Scotland would like to thank all rescue personnel who assisted at the scene yesterday in addition to the many members of the public who offered assistance and support during the incident."

Emergency services were called to reports of people in difficulty in the water at around 4.45pm on Saturday.

A major rescue operation was launched and five people were pulled from the water and taken to Aberdeen Royal Infirmary.

The Maritime and Coastguard Agency said two of those rescued were pulled from the sea by Aberdeen inshore lifeboat crew and others were recovered by police.

Scotland's First Minister Nicola Sturgeon was among those paying tribute.

She tweeted: "Tragic, heartbreaking news. My thoughts are with all those involved."

Aberdeen Central MSP Kevin Stewart posted: "Sorry to hear of the tragic event that has taken place at Aberdeen beach. My thoughts are with those involved, their families and friends."