A 21-year-old man has been arrested over abusive messages sent to freelance journalist Caroline Criado-Perez on Twitter. The man - who is said to be from Manchester - made threats of rape against Criado-Perez after she appeared on television to promote the use of famous women on English banknotes, Sky News reports. Criado-Perez tweeted to confirm the arrest, adding: "Just at the police station now about to make a formal statement. There are many more threats to report. #shoutingback."