The bodies of a man and a woman were discovered at a shooting school, prompting the opening of a murder investigation.
At around 3.40 pm on Friday, Humberside Police were called to the White Lodge Shooting School on College Road close to Thornton Curtis.
Officers were alerted to reports of potential danger.
Man and lady were found dead at the site when they arrived.
Senior investigating officer Chief Inspector Al Curtis said: ‘Inquiries are in the very early stages to establish the circumstances of the man and woman’s death.
‘A homicide investigation has commenced, and both deaths are being treated as suspicious at this time until we establish the facts.
‘We can confirm we are not looking for any else in relation to this inquiry.
‘A scene guard will be in place while we carry out our investigation, and residents will likely observe an increased policing presence in the area as we carry out all lines of inquiry.’
He said next of kin of both victims have been notified and are being supported.
Several police vehicles were seen in the grounds and a tent was erected as forensic teams scoured the areas and inside the main building.
The lane leading down to White Lodge was also cordoned off with police guarding the entrance.
A coastguard helicopter also circled the area.
‘We would like to reassure local residents there is no risk to the wider public and that we will be conducting house-to-house visits to provide reassurance,’ Mr Curtis added.
White Lodge Shooting School is located near the medieval ruins of Thornton Abbey in North Lincolnshire and eight miles south of the Humber Bridge.