Some 3,100 rockets have also been fired by Palestinian militants toward Israel since conflict escalated on May 10 in the heaviest exchange of fire between the rivals in years, sparked by unrest in Jerusalem.
In the latest, the interior ministry said Monday that at least 11 people were killed by a bomb that struck a bus overnight in southeastern Zabul province.
Guterres called on all parties to refrain from further violence while the United States, a key ally, warned of sanctions if negotiations for elections did not urgently resume.