Photos of people who died in attack
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Families of Quetta blast victims search for answers

22 February 2013 Last updated at 22:35 GMT

Pakistani police say they have arrested 170 suspects after a bomb attack last Saturday which targeted a Shia Muslim area in the western city of Quetta.

Security sources said police killed four people, including a bomb-maker accused of anti-Shia attacks.

Last Saturday's bomb ripped through a busy market district, killing almost 90 people and injuring some 169 more.

Orla Guerin reports.