Plans for the site to house asylum seekers were scrapped by the government in September.

Six fire crews were sent to the property on Marton Road, in Sturton by Stow, on Friday afternoon.

Campaigners say they opposed the plan because it would have harmed the site's historic significance.

The Home Office said on Thursday it had abandoned plans for an asylum centre on the site.

Concerns are raised that continued uncertainty could hit a £300m deal to regenerate RAF Scampton.

The visitors came from the Möhnesee district in Germany that was impacted by the raids.

The site, near Lincoln, is due to house up to 800 asylum seekers under Home Office plans.

Cost of four sites will run to £1.2bn and outstrip estimated bill for private rooms, watchdog finds.