As many as three dozen criminals who converted to Islam in American prisons have moved to Yemen where they could pose a "significant threat" to attack the U.S., according to a report on al Qaeda from the Senate Foreign Relations Committee to be released Wednesday.

"The group seeks to recruit American citizens to carry out terrorist attacks in the United States," said Sen. John Kerry, D.-Mass., the committee chairman.

The Senate report said that while the ex-convicts "ostensibly" moved to Yemen to study Arabic, U.S. diplomats and law enforcement officials in Yemen "feared that these Americans were radicalized in prison and traveled to Yemen for training."

An American official said the prison converts were believed to be primarily from the New York state prison system.

Read the complete original version of this item...