Catholic youths rush away as a gas cannister explodes in their midst during disorders in the Bogside district of Londonderry, near the scene of the "bloody Sunday" killings earlier in the month. Youths had used nail bombs and gelignite to attack British armoured cars (in the foreground, left) during the late afternoon clash. Troops hit back with a hail of rubber bullets and C.S. gas. (AP-Photo) 10.2.1972