A man has been arrested over a tweet allegedly calling for people to "Jo Cox" an MP.
Anna Soubry, MP for Broxtowe in Nottinghamshire, had slammed the user - who has since deleted their account - a "sad cowardly troll", and warned such comments were a threat to freedom of speech.
Nottinghamshire Police confirmed they were investigating the incident, and on Saturday the Metropolitan Police said a 25-year-old man had been arrested at his home in Bethnal Green, London, on suspicion of sending malicious communications.
He remains in custody and has not been charged.
It comes after 43-year-old Thomas Mair was jailed for life for the murder of Batley and Spen MP Jo Cox.
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Police have arrested the second Pentonville Prison escapee who absconded on Monday.
James Whitlock, aged 31, was arrested in Homerton, London on Sunday afternoon.
He broke out of the prison with fellow inmate Matthew Baker, aged 28, who is awaiting sentencing for attempted murder.
Baker was allegedly discovered on Wednesday night with a broken leg hiding under a bed at his sister's house in Ilford, east London.
According to reports the cellmates' beds had been stuffed with pillows to make them look like they were sleeping.
The pair are said to have used diamond-tipped cutting equipment to cut through bars before scaling a perimeter wall to freedom.