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UPV-INAOE-Autoritas-Check That: An Approach based on External Sources to Detect Claims Credibility. Working Notes of CLEF 2018 - Conference and Labs of the Evaluation Forum, 2018. Linda Cappellato, Nicola Ferro, Jian Yun Nie, Laure Soulier (Editors). CEUR-WS.org.With the uncontrolled increasing of fake news, untruthful claims, and rumors over the web, recently different approaches have been proposed to address this problem. In this paper, we present a credibility detector of factual claims in presidential debates. Our approach captures the distribution of the results from the search engines to infer the credibility of the claims. We participated in the CLEF-2018 Check That lab for Task 2, obtaining acceptable results.