Karachi- At least two people were injured in hand-grenade attacks today. According to local police, unknown miscreants lobbed a hand grenade at Ghani Chorangi area of troubled city. According to medics, two injured in today's attack, were later shifted to nearby hospital. Earlier on January 29, 2014, six people were wounded in hand grenade attack on same location. Karachi, a city of 18 million people which contributes 42 per cent of Pakistan's GDP, has been plagued by sectarian, ethnic and political violence for years.