SINGAPORE RIOTS TAKE RISING TOLL; Leader of the Region Fears Destruction of Malaysia
rises to 18; hundreds injured, over 1,000 arrested; Singapore Prime Min Lee Kuan Yew warns on growing racial tensions, news conf; blames rioting on Malayan extremists and Indonesian propagandists; 10,000 policemen and troops seek to quell rioting; curfew reinstated; riot scene illus