Detectives probing the kidnapping of Chinese national Xue Hua Shan said they are still working on all leads.Shan, 31, was reported abducted outside her home on Seventh Street, Barataria, on April 14.A $4 million ransom demand had been made for her safe release.Shan is the owner of Happy Gardens Restaurant, St Helena Main Road.The police have been conducting investigations in Barataria, Blanchisseuse, Port-of-Spain and environs.Anthony Chin, owner of the Ellerslie Plaza's China Palace Restaurant, was a suspect in Shan's kidnapping, police said.Chin, 61, of Hillsborough, Maraval, was killed last month outside his restaurant.