FILE PHOTO: The Google logo is pictured atop an office building in Irvine, California, U.S., August 7, 2017. REUTERS/Mike Blake/File Photo

SAN FRANCISCO (Reuters) - Search engine Google said on Thursday it had seen no evidence on its advertising platforms of the kind of suspected Russian propaganda campaign that Facebook Inc FB.O says appeared on its network before and after last year's U.S. presidential election.

"We're always monitoring for abuse or violations of our policies and we've seen no evidence this type of ad campaign was run on our platforms," Google, a unit of Alphabet Inc GOOGL.O and the owner of YouTube, said in a statement in response to questions.