14:33
Gaynor Lord's behaviour was 'out of character' in the time before she disappeared, police say
The spokesperson continued: 'At the moment the CCTV is telling us that she left work and she made her way over a period of time to the river where she was seen.
'Nobody has seen her go into the water but we know she ended up in the park. At the moment there's nothing else that the CCTV has shown us about who she may have spoken to, any interactions she might have had.
'Some of this behaviour is out of character. We can't explain some of her behaviour that day.
'We're working closely with the family, with friends, with anybody else that may have had contact with her in recent days and weeks to try to understand what might have happened.'
He added: 'We're supporting the friends and family as close as we can. People are very shocked by what's happened and nobody knows why she's done what she's done.
'We will just have to work to see if we can find it out.'
14:29
Police pursuing leads about missing mother's 'behaviour' in the lead up to her disappearance
Asked why police were so sure the missing mother had entered the River Wentsum, the spokesperson added: 'There are a number of lines of inquiry that we are pursuing but everything that we know is pointing to a high probability that Gaynor went into the water.
'That would be from the CCTV, from the very limited witnesses we've got available to us and other lines of inquiry that we are pursuing about Gaynor's behaviour in the lead up to her disappearance.
'At the moment the river is a really key factor for us.
'That's not to say that other specialist police teams aren't working on other lines of inquiry, because they are, but at the moment you are seeing that intensive effort around the searching of the water and the parks around this area.'
14:22
Police spokesperson says 'working hypothesis' is that Gaynor Lord entered a river
A representative of Norfolk Police has issued an update on the search for Gaynor Lord as the hunt continues for the missing mother along the banks of the River Wentsum, where her clothes were found.
Speaking to reporters at the riverside on Thursday afternoon, he said the 'working hypothesis' remains that the 55-year-old entered the water.
He told reporters: 'The investigation is still very much focused on the river. Our working hypothesis remains that Gaynor is in the river, even though we are exploring other lines, as you'd expect us to keep a very open mind.
'That's why you've seen quite a considerable intensive searches of the river today.
'A specialist team from Lincolnshire is also assisting us so we're putting sonar equipment across the river at the moment which is quite detailed and allowing us to target divers to where there may be objects.
'Equally it's very very challenging. The river is very, very full of water with all the rain, full of lots of debris, the divers can see about one foot in front of them, so it's a very extraordinary challenging environment for them to work in.
'It's slow and methodical at the moment. It will take a couple of days for us to be content with what we've done. It may even be longer.'
Follow MailOnline's blog for key updates as police continue to search for mother Gaynor Lord who went missing from the centre of Norwich last week.
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