The psychiatrist who was severely injured by a bomb in his Mount Vernon office in May has recovered enough to begin physical therapy, but law enforcement officials say investigators still do not have a suspect in the blast.

Paul J. Peckar, 50, was critically wounded when he opened a package containing a mail bomb.

Burned over 55 percent of his body, Peckar was flown to the Washington Hospital Center burn unit shortly after the explosion, which damaged much of his third-floor office in the Sherwood Hall Medical Center. Weeks in intensive care and operations to treat an abdominal wound and burns followed.

"He's in rehabilitation essentially, learning to use his limbs again. He's still quite bandaged up," said Sandra R. Gregg, spokeswoman for the hospital. Gregg said Peckar would probably have more skin graft operations and could be released in the next few weeks.

Douglas Turner of the U.S. Postal Inspection Service, which is spearheading the investigation, said that despite pursuing several leads, "really it's pretty static. We just haven't had any revelations."

"We've eliminated some of the leads but we still haven't narrowed it down to be able to say it's these one or two people," Turner said, adding that it is not unusual for bombing investigations to last several months.

Representatives of the Paul J. Peckar Fund held a lobster festival in Alexandria last month that raised more than $20,000 to help the family make ends meet while Peckar is away from work.

Daniel D. Geller, an Alexandria real estate broker and friend of the Peckar family, said the fund has arranged for a Paul Peckar night when the Chicago Black Hawks meet the Washington Capitals in November. Proceeds will be donated to the fund.