Police in Derbyshire are seeking the public's assistance following a serious incident involving two teenage girls. The girls were reportedly "seriously sexually assaulted" at a park in Heanor on Halloween night. The assault occurred between 9pm and 11pm on 31 October, according to a statement from Derbyshire Police. Authorities are urging anyone with information or who may have witnessed the events to come forward. The police have not disclosed further details about the victims or the circumstances surrounding the attack. Investigators are working diligently to gather evidence and identify any potential suspects. This incident has raised significant concern within the local community, prompting police to increase patrols in the area. Anyone with information is encouraged to contact Derbyshire Police directly or to report anonymously through Crimestoppers. This is a developing story, and updates will be provided as more information becomes available.