BOSTON -- The Children's Hospital doctor who was the victim of an attempted mail bombing in which Amy Bishop and her husband were questioned has raised questions about the thoroughness of that investigation.

Bishop, who is accused in an attack that killed three fellow biology professors at the University of Alabama, was questioned by authorities after the 1993 incident in Newton, Mass.

"I was targeted with a bomb sent through the mail to our home. We called the police who alerted federal authorities. Amy Bishop and her husband were questioned, but were never charged," said Dr. Paul Rosenberg, a Harvard professor who worked with Bishop at Children's Hospital Boston.

A spokeswoman for Rosenberg said she believes he doubts the thoroughness of that investigation.

"We hope that there is a thorough investigation into this recent crime (in Alabama), so that no one else will be victimized by such senseless violence," Rosenberg said.

The investigation in 1993 was done by the U.S. Postal Service. A spokesman for the Postal Service said he could not comment on this specific case, but said "his agency has a pretty good track record."

Bishop's husband, James Anderson, told The Associated Press he and his wife were among a number of innocent people questioned by investigators who cast a wide net. He said the case "had a dozen people swept up in this, and everybody was a subject, not a suspect."

"There was never any indictment, arrest, nothing, and then everyone was cleared after five years," he said.

Anderson also said his wife had been writing a novel at the time that was reviewed by law enforcement.

"It was just a novel. A medical thriller is the best way to describe it," he said.

Rosenberg and his family left their house after the mail bomb was discovered. The explosives did not go off and no one was injured.