Pakistani authorities have arrested four suspects in Karachi (Pakistan's largest city and commercial hub) in connection with an organised scheme to leak matriculation — secondary school — exam papers through WhatsApp groups. The main suspect, a final-year cybersecurity student named Mobin Khan, is alleged to have run at least 13 WhatsApp groups with up to 1,000 students each, charging between Rs800 and Rs1,200 per student and earning roughly Rs250,000 in a short period, using a UK mobile number to evade detection. Investigators say at least two further criminal gangs are linked to the operation, bringing the total number of groups implicated to ten, and a formal case has been filed under the Pakistan Penal Code and the Telegraph Act as the probe continues.