Afghanistan urged an end to cross-border attacks from Pakistan in a foreign ministry statement Friday, saying such incidents could affect \"improving trust and cooperation\". \"The ministry of foreign affairs of Afghanistan expresses its serious concern about the continuing Pakistani artillery shelling of Afghan villages in Kunar and Nangarhar provinces,\" it said. The statement added that in the latest of a string of incidents, four children were killed late Thursday in the northeastern province of Kunar by Pakistani shelling.