Bear Stearns & Co. has hit Impac Mortgage Holdings with new margin call requests, according to a source familiar with the situation.Under a margin call, a lender is asked to post additional capital because of concerns about loan buybacks. In Bear's case, the margin calls are not huge, the source said, but will put additional pressure on the nondepository lender/servicer. Officials at the Irvine-based Impac did not return telephone calls about the matter by deadline time. A Bear spokeswoman declined to comment.

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