At least six people were killed and six, including two bystanders, were injured, when two groups exchanged heavy fire in front of Balochistan University on Tuesday morning. The police have registered a case and also made raids to arrest the culprits involved in the incident. It remained unclear why the two groups exchanged fire.One killed in blast: A powerful blast jolted Qila Abdullah, a border city of Balochistan, on Tuesday, killing one man and injuring three. Salahuddin, the nazim of Qila Abdullah, said that some workers were unloading a truck containing metal scrap from Afghanistan when all of a sudden a bomb went off. Pakistan has been getting scrap from Afghanistan, where a 30-year long war has destroyed many tanks, aircrafts and other vehicles.