Other sources also mention armed police "anti-gang" raids in the morning, UKBA immigration checks, and a BBC camera crew to film the whole thing. Alongside the arrests and searches there will also be an "engagement
event" featuring a dance troupe and Battersea dogs home (2-6pm in Windrush Square). "This day will be supported by the mobile CCTV van and increased police patrols during the evening as well as arrest enquiries on those persons involved in gang related violence."

This is indeed "the return of the discredited policing tactic Operation SWAMP to central Brixton. The discredited policing tactic that saw hundreds of officers literally swamp local communities triggered the civil rights uprising of 1981." (see  http://leejasper.blogspot.co.uk/2014/03/police-operation-swamp-81-returns-to.html) Now used to set the seal on the middle class gentrification of Brixton with a total state clampdown on all undesirable elements.

Various groups are calling for people to gather in Windrush Square at 1PM (before the start of the "engagement event"), as well as to keep an eye out for police and immigration attacks throughout the day.

For more info see:

 https://network23.org/antiraids/2014/03/05/thursday-6th-march-stand-up-against-state-repression-in-brixton/
 https://www.facebook.com/SouthLondonAF
 http://leejasper.blogspot.co.uk/2014/03/police-operation-swamp-81-returns-to.html