Police have arrested two men and charged a third after deputy Labour leader Angela Rayner was subjected to a series of abusive messages including death threats.
Benjamin Iliffe, 36, of Slade Way, Chatteris, Cambridgeshire, has been charged with malicious communications and possession of cannabis, Greater Manchester Police (GMP) said.
In a statement, GMP also said a 52-year-old man arrested in Halifax, West Yorkshire, on Wednesday has been bailed, while a 70-year-old man has been arrested on suspicion of malicious communication relating to abusive emails received on Saturday, Oct 16.
The Telegraph understands that Ms Rayner has been the subject of death threats.
A Greater Manchester Police spokesman said: "One man has been charged and an additional arrest has been made in relation to a police investigation into multiple reports of threatening and abusive phone calls, emails and letters towards a woman in Ashton-under-Lyne.
"Yesterday (Wednesday, Oct 27) officers from GMP attended an address in Halifax and arrested a 52-year-old man.
"The man was arrested on suspicion of malicious communications and has since been released on bail pending further enquiries. His arrest relates to abusive phone calls received on Friday 15 October.
"An additional arrest was made this morning (28 October) in conjunction with South Yorkshire Police. A 70-year-old man was arrested on suspicion of malicious communication and he remains in custody for questioning.
"His arrest relates to abusive emails received on Saturday 16 October.
"In conjunction with the investigation, police in Cambridgeshire have also charged one man. Benjamin Iliffe of Slade Way, Chatteris, Cambridgeshire, has been charged with malicious communications and possession of cannabis.
"He has been remanded into custody and will appear before Huntingdon Magistrates Court later today.
"Enquiries remain ongoing and GMP continues to work in partnership with Cambridgeshire Constabulary and South Yorkshire Police."
On Wednesday spokesperson for Angela Rayner said: "Angela and her staff have received a number of threatening, malicious and abusive communications in recent weeks.
"We are working with the police to ensure that the perpetrators of these crimes are brought to justice and Angela would like to thank the police for their work during these investigations.
"Abuse and threats of this nature don't just have an impact on Angela but also on her family, her children and her staff who are on the receiving end of these communications.
"Angela is currently on bereavement leave after losing a close loved one and she looks forward to being back at work as soon as possible."