Pakistani security forces were conducting search operations on Friday to flush out militants suspected of hiding near two military bases attacked by insurgents on Wednesday, which killed seven soldiers and 13 of their own, in the latest violence in the southwestern Balochistan province. The attacks, the biggest in recent years by ethnic Baloch insurgents, came hours before Pakistani Prime Minister Imran Khan arrived in Beijing for the opening of the Winter Olympics, where he will have meetings with Chinese President Xi Jinping and other leaders. Two Pakistani security officials, requesting ano…