Residents have been allowed to return home after suspected hazardous material was found in a flat in Selby.
A number of flats at Cockret Court had been evacuated in the early hours of this morning after police officers searching a property found the materials.
It followed the arrest of a 60-year-old man yesterday afternoon on suspicion of racially or religiously aggravated harassment and criminal damage.
In an update, North Yorkshire Police said the 100m cordon put in place had now been lifted.
A spokeswoman said: "In a multi-agency investigation, the suspected hazardous materials found at a property were later deemed to be safe and residents have been allowed to return to their homes.
"The investigation is ongoing and a scene guard remains in place."
Officers are continuing to question the arrested man, who remains in police custody.