A four-storey building being demolished has collapsed on the edge of downtown Philadelphia, killing six people, officials say.
Mayor Michael Nutter identified one of the dead as a 35-year-old woman but did not release any further information about the others killed in the tragedy.
Rescue crews worked for hours to extricate people trapped amid the rubble inside a Salvation Army thrift store, which was nearly obliterated by falling debris.
http://news.sky.com/story/1099840/building-collapses-in-downtown-philadelphia
