U.S. mortgage rates fell in the past week to the latest in a series of record lows as yields on government debt dropped, according to a survey released on Thursday by Freddie Mac, the second-largest U.S. mortgage finance company.

Rock-bottom rates offer a glimmer of hope for a housing market that has failed to find footing in the aftermath of the expiration of popular home buyer tax credits.

Interest rates on U.S. 30-year fixed-rate mortgages, the most widely used loan, averaged 4.32 percent for the week ended Sept. 2, down from the previous week’s 4.36 percent and its year-ago level of 5.08 percent, according to the survey.

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