The Carter administration scuttled a 1980 plan to swap military parts for the 52 American hostages in Tehran when it began to doubt that its Iranian go-between had his government's backing, a newspaper reported.

Newly declassified documents, mostly Carter-era CIA and State Department memos, provide the first detailed account of President Carter's efforts to extricate the hostages before the 1980 election, which Ronald Reagan won by a landslide, The Miami Herald reported Sunday.The documents were turned over to Rep. John Conyers, D-Mich, chairman of the House Judiciary criminal justice subcommittee, as part of his investigation into whether Reagan's 1980 campaign made a secret arms-for-hostages deal with Iran.