PHOTOGRAPHS - Tears in their eyes. Guatemala city: Rioting Guatemalan students try in vain to keep the tear gas fumes from their eyes as they run from the tear gas bombs thrown by police during demonstrations here March 13th. Military police battled teen-age mobs here 3/13 in a day of wild street fighting in which at least 80 persons were wounded and more than 100 were arrested. The rioters were protesting alleged government frauds in December's congressional elections and "repressive measures" ordered by the government under the current state of siege emergency regulations