A spokesman for Northumbria Police say they believe two teenage girls have gone into the river.
Police, fire and ambulance services are continuing to carry out searches.
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The woman had been at the O2 Academy on Westgate Road with friends when she was attacked on Pink Lane in Newcastle city centre.
Lewis Rider, who turns 23 on September 7th, purchased the scratchcard this week whilst buying a tin of food for his dog, Marley.
The newborn baby boy, who was treated by hospital staff, was found by a dog who started barking to alert his owners.