ISLAMABAD - A powerful explosion hit near a second upscale market in Pakistan's eastern city of Lahore on Thursday, a government official said, the latest in a new surge of violence across the country. There were no immediate reports of casualties. An second explosion in Lahore's Gulberg area came hours after a blast at another upscale market killed at least five people and wounded 21. 'Initial reports are of an explosion in the Gulberg area,' a Punjab government official told Reuters, requesting anonymity until authorities had more details. He said the explosion occurred on a main boulevard lined with shopping plazas and restaurants. Pakistan has been struck by a wave of terrorist attacks in recent weeks, killing at least 130 people across the country and leaving hundreds wounded. The worst of the attacks was at a Sufi shrine in southern Sindh province that killed 90 people this month.