GLOBAL MARKETS-Shares fall on continued Cyprus concerns

* European shares fall with Cyprus still a concern * Data latest sign of U.S. housing strength * German government bonds rise, periphery bonds dip By Ryan Vlastelica NEW YORK, March 19 (Reuters) - Global stock markets fell on Tuesday, extending the previous day's decline as investors continued to fret about the state of Cyprus' economy. Markets have been volatile, with U.S. stocks opening lower and then briefly rebounding as investors used strong housing data as an opportun