Istanbul Explosion Causes Building Collapse and Search
Natural gas explosion caused the collapses.
Blast occurred at noon, prompting search-and-rescue teams.
Nine people found under rubble from the collapse.
One building was two stories, the other a neighboring structure.
Istanbul Governor Davut Gul said seven recovered and treated.
TRT (Turkish Radio and Television) reported an eighth hospitalized.
Survivors stable with no one in critical condition.
Search continues for final missing person.