Councillor Muhammed Butt, Leader of Brent Council, said:
“Today, Brent has been shaken by an appalling and deeply tragic incident at the Civic Centre, in which a person has lost their life.
“Our thoughts are first and foremost with the victim, their family and loved ones, as well as the staff, residents and visitors who witnessed what happened.
“The Civic Centre has been evacuated and will remain closed until further notice. I would urge people to avoid the area and allow the police and emergency services to carry out their work.
“There is an active police investigation underway - please do not speculate or repeat any unverified claims online. We are working closely with the Metropolitan Police and will provide further updates as soon as we are able.
“I want to express my sincere thanks to the police, paramedics and emergency services for their swift response, and to our staff for the professionalism, compassion and calm they have shown today in the most difficult of circumstances.”