By Shabbir Mir in The Express Tribune, April 16 GILGIT: More than 20 suspects have surrendered during the ongoing crackdown against criminals in Darel Tangir valley of Gilgit-Baltistan (G-B), said police chief Usman Zakria. During a press conference on Monday, Inspector general of Police (IGP) Zakria gave details of the operation. It was launched by the government after a police van in the valley was attacked. Two policemen, one of them a DSP, were killed…