Pentagon investigating top Afghanistan commander as scandal widens

Former CIA director David Petraeus
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The growing scandal involving former CIA director David Petraeus has now ensnared another big military name as the top commander of U.S. forces in Afghanistan finds himself under investigation.

Last week Petraeus stepped down from his post, admitting he had cheated on his wife with a woman identified as his biographer Paula Broadwell.

General John Allen, commander of allied forces in Afghanistan, is now under investigation for sending inappropriate messages to Jill Kelley. Kelley is the woman who claimed harassment by Broadwell, starting the investigation that eventually exposed Petraeus' marital infidelity.

FBI preparing timeline of its Petraeus probe

Meantime, the FBI is preparing a timeline of the criminal investigation that exposed Petraeus' extramarital affair so it can explain to lawmakers why they weren't notified of the probe months ago.

The White House wasn't informed of the FBI investigation until Election Day, and the head of the Senate Intelligence Committee says she first learned of the matter from the media late last week.

Last Friday, Petraeus acknowledged an affair with his biographer, Paula Broadwell, and resigned.

Part of the FBI investigation was still under way Monday in North Carolina, where agents conducted a search of Broadwell's home.

Also, the top American commander in Afghanistan is under investigation for alleged "inappropriate communications" with the woman who is said to have received threatening emails from Broadwell.