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STORY: Pakistan's Lashkar-e-Jhangvi, which intelligence officials say has become a major security threat, claimed responsibility for a sectarian attack on Shi'ites which killed at least 64 people in the city of Quetta on Saturday.
Officials said most of the dead were from Pakistan's Shi'ite minority, which has come under siege from Sunni extremist groups who seem to carry out sectarian attacks at will.
Police in Quetta said at least 130 people were injured in the explosion that was caused by an improvised explosive device fitted to a motorcycle.
More than 400 Shi'ite were killed in Pakistan last year, many by hitmen or bombs, and the perpetrators are almost never caught.
A spokesman for the LeJ claimed responsibility for Saturday's bloodshed near the main bazaar, school and computer center.
Bomb kills at least 64 in Pakistan's Quetta (0:41)
Feb. 16 - The death toll from a bombing in the Pakistani city of Quetta on Saturday climbs to 47, police officials say. Rough Cut (no reporter narration). ( Transcript )