After months of chasing a maze of nearly 100 hoax bomb threat emails that rattled schools, courts and public institutions across the Tricity, the Chandigarh Police has zeroed in on a crucial link — an accused arrested in Gujarat. The UT Police is now preparing to seek his custody on what they suspect could be a wider, anonymised and possibly transnational network. According to police sources, the accused, identified as Sourav Biswas (30), was arrested on March 1 in a joint operation by the Ahmedabad Crime Branch and Cyber Crime Cell in connection with a series of similar hoax bomb threat emails sent to institutions in Gujarat. Originally from Bangladesh and reportedly residing in West Bengal, Biswas is alleged to have been running an online marketplace selling compromised email IDs for as little as $1. Police officials in Chandigarh said Biswas’s suspected role has emerged during the ongoing probe into emails received in Chandigarh, Panchkula and Mohali over the past few months.…