A Coastguard spokeswoman said they were hoping to get in contact with the parents of the two boys.
She said: "We would like to hear from the parents to confirm that the children are, in fact, safe."
It is understood that the boys were reported missing at midday but the parents had not been in contact with the emergency services since about 1pm.
More top news
The Prime Minister and the Leader of the Opposition praised the courage of Britain's armed forces in a Christmas message to troops.
Nick Clegg has vowed to avoid appearances on reality shows like I'm a Celebrity Get Me Out of Here! when he stands down as an MP.
Immortalised in the film Zulu, the Battle of Rorke's Drift is an iconic episode of British military history.