kabul civilian casualties religious attack afghanistan primarily shi ite mosques significantly increase last two years accord unite nations 850 casualties 273 fatal record u.n. 's assistance mission afghanistan unama since begin last year 50 incidents nearly double figure previous seven years goo.gl/93cjre late attack take place three weeks ago two shi ite mosques one kabul central province ghhor kill least 72 people islamic state claim responsibility string others across country recent months sectarian violence relatively rare sunni-dominant afghanistan since 2015 islamic state escalate fear kill score shi ites minority shi ites accuse government ignore need unama recommend action afghan government protect people place worship attack casualties religious attack afghanistan rise steeply u.n