A social media account independently linked by Keryex intelligence platform AVERZ to the gunman responsible for Thursday’s deadly shooting in Washington, D.C., reveals an extensive history of complaints about deteriorating conditions at the condominium building where he lived. Operating under the name OfMiceandMold, the account documented alleged water intrusion, mold, rodent infestations and disputes involving property management at the Metropole Condominiums in Logan Circle. The posts included photographs, building notices and excerpts from documents concerning maintenance problems and repairs dating back several years. Hours before the shooting, the account published a document described as a manifesto, although its author characterized it as an engineering report.

The account, using the handle @miceandmold, described itself as a source of information about the Metropole and EJF, the building’s property management company. Its posts repeatedly criticized conditions at the property and questioned whether management had adequately addressed structural and maintenance concerns. Several publications included photographs showing what appeared to be extensive water damage, exposed building materials and dark staining that the account attributed to mold. Other posts alleged recurring pest infestations, including an Oct. 30 notice warning that mice had returned to the building’s second floor. The authenticity of the account’s photographs as evidence of specific building defects, and the extent of the reported conditions, have not been independently established.

The grievances extended beyond water damage and pests. In recent days, the account published complaints about building security, including an alleged garage break-in and a separate incident involving a malfunctioning fire alarm system. One post shared a notice attributed to the building’s management stating that a fire alarm could not be reset following an earlier activation, requiring a temporary fire watch. The notice also indicated that exterior doors would remain unlocked overnight because of the system’s condition. Another post cited District of Columbia property disclosure requirements involving known defects, including water leaks, mold and rodent infestations.

The account’s most significant publication came early Thursday morning, hours before gunfire erupted near the building. In a post timestamped 5:06 a.m., the account declared, “My manifesto is an engineering report,” alongside images of a document detailing alleged problems at the property. The visible excerpts identified condominium units reportedly affected by building envelope issues before and after facade and balcony work conducted in 2023 and 2024. They also referenced assessments attributed to an individual identified as Dr. Lambert, including reports of additional water intrusion following the renovations. The document appeared primarily concerned with the history of maintenance disputes and alleged building deficiencies, rather than containing an explicit threat of violence in the excerpts reviewed.

The posts provide additional context to statements from Metropolitan Police Department interim Chief Jeffery Carroll, who said the suspected shooter had apparently been involved in a dispute with the building’s homeowners association. Authorities say the gunman opened fire at and near a VIDA Fitness gym along 15th Street NW in the Logan Circle neighborhood shortly before 8 a.m. Thursday, killing one person and injuring four others. Police said the suspect subsequently barricaded himself inside a seventh-floor apartment in the nearby condominium building. He died from an apparent self-inflicted gunshot wound after officers established contact with him during the standoff.

The connection between the social media account and the suspected shooter was independently verified by AVERZ, Keryex’s intelligence platform. The account’s publication history provides a detailed record of grievances involving the same property where police say the gunman had been involved in a dispute with the homeowners association. However, the existence of those complaints does not establish that the alleged building conditions were responsible for the shooting or that the posts reveal the gunman’s precise intentions. Investigators have not publicly determined whether the attack specifically targeted individuals connected to the property’s management or homeowners association.

The shooting prompted a substantial emergency response involving local police and federal law enforcement agencies, including the FBI and Bureau of Alcohol, Tobacco, Firearms and Explosives. Police cordoned off surrounding streets while tactical officers responded to the apartment building, where a fire was also reported during the standoff. Authorities have not publicly identified the gunman or announced a definitive motive. The investigation remains ongoing as detectives work to establish the circumstances surrounding the attack and whether the suspect’s documented grievances played a role in the violence.