Police have received 20 calls after setting up a phone line to coincide with a television documentary about missing York chef Claudia Lawrence.
Missing - The Claudia Lawrence story was shown on Channel 4 on Friday night and follows her family in the 16 months since she was last seen.
North Yorkshire Police said the phone line would stay open over the weekend.
The search for Miss Lawrence was scaled down last month but officers said people could call with new leads.
Her father Peter Lawrence said he hoped the programme would prompt new information.
Miss Lawrence, who was 35 years old when she went missing, was last seen leaving her workplace on 18 March 2009.
Her disappearance is being treated as suspected murder.
The telephone number is 01609 768 181.