QUETTA  - Unidentified armed men hurled a hand grenade at a house here in the provincial capital, on Monday, police said. The grenade was thrown at a residence owned by Amanullah Khilji at Nichari Road Shaldara that exploded with a huge blast that scattered windowpanes of the buildings.  However, nobody was hurt in the blast. Police rushed to the site after the blast and started investigations into the incident.