Thousands of homeowners face an "imminent risk" of losing their homes because of clashes between American Home Mortgage Investment Corp. and its former financial backers, according to Freddie Mac, a government-chartered housing financier.

In documents filed with the U.S. Bankruptcy Court in Wilmington, Del., Freddie Mac said it seized $7 million that homeowners sent to American Home to cover principal and interest payments, property taxes and insurance just before the company's Aug. 6 collapse. American Home quit making payments...