HYDERABAD- Police guard deployed on the security of Omar Sheikh, convicted and sentenced in US journalist Daniel Pearl murder case has been shot dead. Some unknown persons opened fire on policeman Ali Ahmad on the night between Tuesday and Wednesday while he was crossing the road after returning from his duty at Hyderabad central prison. He received six bullets and was rushed to Liaqat university hospital where he succumbed to injuries. As per jail authorities, the intelligence agencies had informed about prospective attacks on jail officers and staff. It is feared the banned outfits can be behind this killing.