NEW YORK (AP) — NEW : Witness describes `` windows blowing out , bricks falling down , people screaming '' The city 's Catholic and Anglican cathedrals are damaged ; Christchurch airport is closed .
NEW : Police say the 6.3-magnitude earthquake caused `` multiple fatalities '' NEW : Large-scale evacuations of central Christchurch are under way . NEW : Witness describes `` windows blowing out , bricks falling down , people screaming '' The city 's Catholic and Anglican cathedrals are damaged ; Christchurch airport is closed .