( CNN ) -- A bomb planted in a bicycle killed killed four people and wounded 20 others when it exploded in a busy area of a city in southwestern Pakistan on Wednesday , police said . The explosion took place in Quetta , the capital of the militancy-hit province of Balochistan , said Arif Nawaz , a local police officer . All of those killed were civilians , he said . The perpetrators had planted almost seven kilograms of explosive materials in a bicycle parked in Double Road , one of the busiest areas of Quetta , he said . The target of the blast , which shattered the windows of nearby shops and houses , has n't yet been established , according to Nawaz . No group has so far claimed responsibility for the attack . Balochistan has experienced deadly sectarian violence against its Shiite Muslim minority and is also home to separatists who carry out attacks .
Explosives planted in a bicycle go off in a busy area of Quetta . Recommend0 Syed Ali Raza Jun 09, 2014 03:51pm No group has claimed responsibility for the attack .