Two people have been arrested for sending malicious messages to Wyre Council members over the disappearance of Nicola Bulley, Lancashire Police have said.
The force said it received reports of the messages at the weekend, which led to the arrest of a 49-year-old man from Manchester on suspicion of malicious communications offences.
He has since been released on bail, pending further enquiries, until 12 May.
A 20-year-old woman from Oldham has also since been arrested on suspicion of malicious communications offences and she remains in police custody.
Lancashire Police said enquiries are ongoing.
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A major search has been under way for the 45-year-old after she was last seen on Friday 27 January while walking on a footpath by the River Wyre.
It is understood Ms Bulley went missing in just “a 10-minute window” while she was walking her dog, Willow, close to the river, after dropping off her daughters – aged six and nine – at school.