At least 18 killed, including NATO service member, in two Afghanistan attacks

worldnews.nbcnews.com - Ahmad Nadeem / ReutersA suicide bomber detonated his explosives near a police checkpoint and a bank in southern Afghanistan on Saturday, one of two attacks in the heartland of the insurgency that killed 18 people over 24 hours. Separately, a NATO service member was killed by insurgents in the country's east, according to a military statement.No group immediately claimed responsibility for any of the attacks, but Afghan President Hamid Karzai blamed the bombings on the Taliban.