POLICE have arrested a man in connection with an ongoing investigation into the circulation of letters promoting a so-called 'Punish a Muslim' day.

Officers from Counter Terrorism Policing North East, supported by Lincolnshire Police, arrested a 35 year-old man from South Lincoln in connection with enquiries into offensive communications.

The man is currently being held for questioning in a West Yorkshire police station.

He has been arrested on suspicion of conspiring and soliciting to commit murder, sending a hoax noxious substance, and sending letters or communications conveying a threatening message.

Searches have taken place at a residential property in South Lincoln and an office building in the city centre.

Police had previously confirmed that the letters had been circulated in certain communities in West Yorkshire, as well as South Yorkshire, Leicestershire, and London.

A police spokesman said: "We understand that people may be concerned following this activity.

"However, we would like to reassure communities that this activity is a result of an ongoing, intelligence-led investigation and was not in response to an immediate threat."