OPINION / VIEWPOINT By Global Times Published: Apr 24, 2021 08:50 PM Fire breaks out at the blast site in Quetta, Pakistan's southwest Balochistan province, on Wednesday. Three people were killed and 11 others injured when a bomb went off inside the parking area of Serena hotel in Balochistan province Wednesday night, hospital sources said. Photo: Xinhua Editor's Note: A deadly suicide blast took place on Wednesday at a hotel hosting the Chinese ambassador and diplomats in Quetta in southwest Pakistan. The bomb had detonated minutes before their expected return to the hotel. The Pakistani Taliban later claimed responsibility for the attack. Who was their target? As US troops are expected to completely leave Afghanistan by September 11, what security challenges does Pakistan face following the US withdrawal in terms of its relations with China, the US and Afghanistan? Global Times (