In 1972 , the Provisional IRA killed approximately 100 members of the security forces , wounded 500 others , and carried out approximately 1,300 bombings , mostly against commercial targets which they considered " the artificial economy " . The bombing campaign killed many civilians , notably on Bloody Friday on 21 July , when 22 bombs were set off in the centre of Belfast , killing seven civilians and two soldiers
Bloody Friday
Bloody Friday (1972)
The Troubles