Federal prosecutors say an Indian-born doctor bombed the head of the state's Medical Board last year to retaliate for being censured by the board.

A grand jury charged Dr. Randeep Mann on Wednesday with using a weapon of mass destruction in the February 2009 attack outside Dr. Trent Pierce's home in West Memphis. Pierce lost an eye and suffered severe burns.

Prosecutors would not say whether Mann himself placed the bomb in Pierce's driveway. But they said he planned the attack on Pierce because he was angry that the medical board in 2006 took away his power to prescribe narcotics.

The board found that at least 10 of Mann's patients died after overdosing on drugs he prescribed them.