side of Whitehall. The section of the march which stopped opposite Downing Street reportedly contained veteran anarchists and a group called "Bikers Against The Poll Tax", some of whom became aggravated by reportedly heavy-handed arrests, including one of a man in a wheelchair. Mounted riot police were brought in behind this immobilised section of the march, in theory to clear the protesters from Whitehall, despite both retreat and advance being blocked by further lines of police. Meanwhile, the tail-end had been diverted at the Parliament Square end of Whitehall, and the anarchists it had attracted were at the head of an unpoliced portion of the march. These people walked to Richmond Terrace, bringing the diverted march into Whitehall, opposite Downing Street and behind the police lines on that side of Whitehall. The protesters at the rear of the stationary group, being faced by mounted police seemingly preparing to charge, sat down on the road for safety. Despite black-clothed and scarf-masked people running through seemingly from behind the police lines and urging them up, they remained seated until physically dragged away and arrested for "obstructing Whitehall". The mounted police then advanced at speed, forcing the Whitehall section of the march to fight its way into Trafalgar Square. From 4pm, with the rally nearly officially over, contradictory reports began to arise. According to some sources, mounted riot police (officially used in an attempt to clear Whitehall of protesters) charged out of a side street into the crowd in Trafalgar Square. Whether intentional or not, this was interpreted by the crowd as a provocation, fueling anger in the Square where the police had already been pushing sections of crowd back into corners, leaving no way out except through the police. At 4:30pm, four shielded police riot vans drove into the crowd (a tactic in dealing with mass demonstrations at the time) outside the South African Embassy, attempting to force through to the entrance to Whitehall where police were re-grouping. The crowd attacked the vans with wooden staves and scaffolding poles. Soon after, rioting began to escalate. By 4:30pm, police had closed the main Underground stations in the area and southern exits of Trafalgar Square, making it difficult for people to disperse. Coaches had been parked south of the river, so many marchers tried to move south. At this point, Militant Fed stewards were withdrawn on police orders. Sections of the crowd, including unemployed