A pensioner has been arrested by detectives investigating allegations of offensive messages sent on social media to two MPs, Scotland Yard said.

The 73-year-old suspect was held in West Sussex at around 8.50am on Wednesday following claims by the alleged victims on July 13 and July 20 last year.

The Met Police will not disclose the location where the man lives - a county with a population of 750,000 people - from for operational reasons.

A Scotland Yard spokesman said an inquiry was launched by the Met's Counter Terrorism Command along with the Parliamentary and Diplomatic Protection Command.

The police spokesman said: "These are not being treated as terrorist incidents.

The suspect is being held at an unnamed West Sussex police station.