An counter-terrorism official was killed in an ambush by insurgents in northern Afghanistan, an official said Monday. Gul Mohammad, a district counter-terrorism chief in the northern province of Kunduz, was shot while riding a motorcycle, said Sofi Habib, the district police chief. Habib said police had arrested four suspects. Taliban spokesman Zabiullah Mujahid claimed responsibility for the killing of Mohammad and his bodyguard, according to a report of the German Press Agency "DPA".