NEW Laura Campbell told CNN she was at work at the bottom of a six-story building when the earthquake struck . : Police say the 6.3-magnitude earthquake caused `` windows blowing out are under way . NEW : Witness describes `` multiple fatalities '' NEW : Large-scale evacuations of central Christchurch , bricks falling down , people screaming '' The city 's Anglican and Catholic cathedrals are damaged ; Herald is closed .
NEW : Police say the 6.3-magnitude earthquake caused `` windows blowing out are under way . NEW : Witness describes `` multiple fatalities '' NEW : Large-scale evacuations of central Christchurch , bricks falling down , people screaming '' The city 's Anglican and Catholic cathedrals are damaged ; Herald is closed .