Det Supt Wayne Fox has not disclosed what prompted the current search operation - 12 years after the university chef went missing.

       But he hinted that at least one anonymous source has supplied new information.

       Claudia, 35, vanished after she failed to arrive for work at

       York University. To mark the 12th anniversary of her disappearance, Mr Fox, who took over the case earlier this year, said: "We do continue to receive information from a variety of sources.

       "Some of this information can be discounted because of inquiries we've already made.

       "But at other times we receive information, sometimes anonymously, that appears extremely interesting and sparks for us new lines of investigation.

       "To the people providing this type of information, I want to urge you to get back in touch with as much detail as you can.