By October the offensive became sustained. A particularly devastating strike was on 25 November 1944, when a V-2 exploded at the Woolworth's store in New Cross Road, killing 168 people and seriously injuring 121. Intercepting the supersonic V-2 missiles in flight proved virtually impossible, and other countermeasures, such as bombing the launch sites, were fairly ineffectual. Sustained bombardment continued until March 1945. The final missiles arrived on 27 March 1945, with one of them killing 134 people and injuring 49 when it hit a block of flats in Stepney.