Sasha Johnson, 27, was one of the organisers of the first-ever Million People March to protest against systemic racism in the UK.
“Sasha has always been actively fighting for black people and the injustices that surround the black community, as well as being both a member of BLM and a member of Taking the Initiative Party’s executive leadership committee.
“Sasha is also a mother of three and a strong, powerful voice for our people and our community.
“Let’s all come together and pray for Sasha, pray for her recovery and show our support to her family and loved ones.”
Detectives from the Met’s Specialist Crime Command (Trident) are “pursuing a number of priority lines of enquiry” but no arrests have been made yet.