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.