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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Aitor Karanka's team became the new Sky Bet Championship leaders after defeating Millwall 3-0 at the Riverside.
Things will start to calm down with temperatures picking up.
Campaigners have now called on the government to make alcohol guidelines clearer for pregnant women.