Serious Crime Squad Detectives are investigating incidents where a woman received multiple letters outlining threats of harm against her.

The letters were received between 6 July 2018 and 30 August 2018.

Police seek assistance to identify two males who are potential witnesses. They were seen on Cavanagh Street, Darwin City between 12June and 30 June 2018.

This is a particularly serious case of stalking and anyone with information that may assist police investigations is urged to contact police on 131444 or anonymously on Crime Stoppers on 1800 333 000.