UPDATE @6.00AM: Two girls at the centre of an amber alert have been found safe and well.
The girls were reportedly taken from a home at Caboolture sometime on Saturday by a man known to them, sparking an urgent search.
All three were located at a residence in Caboolture early this morning.
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The man is now assisting Police with inquiries.
EARLIER: Police are seeking urgent public help to find two young girls taken from Caboolture, north of Brisbane, who they believe may be at significant risk.
The girls, aged one and four, were taken from a home on Diamond St sometime on Saturday by a man known to them.
Extensive searches have failed to find them.
Anyone with information on their whereabouts is urged to call 131 564, or for life threatening information please ring 000.
You can also report information about crime anonymously to Crime Stoppers by calling 1800 333 000 or via crimestoppersqld.com.au 24 hours per day. Crime Stoppers is a registered charity and community volunteer organisation.