Glenbryn is in decline and it is fearful of Ardoyne. That does encourage a siege mentality". Tension built and youths from both communities raised more and more flags along Ardoyne Road. On 19 June, a fight broke out between men putting up loyalist paramilitary flags and the occupants of a passing car. Loyalists allege that the car from republican Ardoyne estate rammed the ladder and knocked the two men off. How the episode started remains disputed. In the summer of 2001, the RUC received intelligence that UDA members were planning to "exploit community tensions" to kill Irish nationalists, Catholics and/or police officers. Summer 2001 On Tuesday 19 June, Royal Ulster Constabulary (RUC) officers had to protect children and parents entering the school after they were attacked by loyalist stone throwers. Police described the attack as "vicious". Following the incident, a blockade of the school developed, with loyalists standing across the road and RUC officers keeping the children and their parents away. The following day, the school was forced to close when loyalists blocked the entrance. During the evening, hundreds of loyalists and nationalists (up to 600) clashed with each other and with the police. Shots were also fired at the police and over 100 petrol bombs were thrown. During the riots the police fired a number of the new 'L21 A1' plastic baton rounds for the first time. 39 RUC officers were injured. Nine shots in total were fired – six from loyalists and three from republicans. The trouble came after an explosion at the rear of Catholic homes next to a peace line. Both loyalist and nationalist politicians blamed each other for the violence. This would be the first of many large riots to take place in Belfast within more than a year. The morning blockade continued on Thursday 21 June. About 60 of the school's 230 pupils entered the school through the grounds of another school. Senior Sinn Féin member Gerry Kelly said: "It's like something out of Alabama in the 1960s". Three Protestant families left their homes in Ardoyne Avenue, saying they were afraid of a nationalist attack. During the evening and night there were serious disturbances in the area around the school. Loyalists fired ten shots, and threw six blast bombs and 46 petrol bombs at police lines. Two Catholic homes were attacked with pipe bombs, and a child was thrown against a wall by one