The accident happened beside the M180 near the junction with the A18, South Yorkshire fire and rescue said. Both South Yorkshire and Humberside fire and rescue services attended the scene. The number of casualties is not known. A spokeswoman for Humberside police gave brief details about the incident. She said: "Humberside police are at the scene of a helicopter crash at Sandtoft. It involved one helicopter. One person was on board the two-person helicopter. "Air crash investigators are en route and there will be a joint investigation between air crash investigators and Humberside police." The spokeswoman was unable to give further details, but said emergency services were called to the scene at 12.44pm.