Muhammad forced his way into the office building around noon Wednesday, according to Arlington County police, and assaulted the victim. When officers responding to 911 calls arrived, there was an exchange of gunfire. Both Muhammad and the victim were taken to hospitals for treatment. He remains hospitalized; the victim has been released.

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Although police initially described the incident as a reported shooting, they are now declining to say whether the victim was shot before or after police opened fire.

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“This remains an active criminal investigation with crime scene evidence, ballistics and witness statements still under review,” police spokeswoman Ashley Savage said.

Police said the shooter and victim knew each other, but their relationship remains unclear. The victim worked at the National Waste & Recycling Association, the trade group confirmed; a spokesman called the incident “a domestic situation.”

Court records show Muhammad, who then went by Macklin, was sentenced in 1992 to 37 years in prison for shooting and killing 22-year-old Shaun Herbert outside a grocery store in the Nauck area of Arlington. It was a “neighborhood dispute,” The Washington Post wrote at the time, that ended with Muhammad shooting Herbert in the chest twice at close range.

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He was out of prison on parole because his conviction occurred before 1995, when Virginia abolished discretionary parole, making Muhammad still eligible. He was released in June 2017, according to the Virginia Department of Corrections.

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On July 15, Muhammad, who now lives in D.C., punched a man named Lamar Jones in the chest and threatened to shoot him in the Fort Dupont neighborhood, according to D.C. police. Jones told police Muhammad was his sister’s boyfriend, according to court documents. At the time of his arrest, he told officers that he was on parole for murder, according to police.

Muhammad was released from custody in D.C. last month after pleading not guilty to two misdemeanors, with a protective order put in place.

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He was then arrested in Fort Dupont Park by U.S. Park Police on a gun charge on Aug. 20, according to police.