PHILADELPHIA-Search and rescue efforts continue this morning at the site of a building collapse here that has left six people dead and 14 injured.

Philadelphia Mayor Michael Nutter told reporters Thursday morning that search and rescue workers had combed approximately 75% of the site of yesterday's collapse of two buildings at 21st and Market streets in Center City.

Nearing midnight on Wednesday evening, rescuers were able to pull out 61-year-old Myra Plekam from the debris, more than 13 hours after the collapse. Plekam was awake and talking to rescuers, before she was taken to a hospital in critical condition, said Deputy Fire Chief Robert Coyne to the Philadelphia Inquirer. The bodies of all six victims were recovered in a Salvation Army thrift store adjacent to the building collapse. The thrift store was filled with shoppers Wednesday morning, unaware that an excavation crew knocking down walls at a gutted building next door was about to yank a beam with heavy machinery, causing the building to collapse on to the store.

“Our thoughts and prayers go out to those who lost their lives, and their families," Philadelphia Mayor Michael Nutter said. The mayor promised a "wide-ranging" probe into the collapse at a press conference this morning. See story in the Inquirer.