women com welcome to our vi the united states and around the world. we begin with the race to find survivors in turkey and syria more than 24 hours after an earthquake that has killed more than 5,000 in the two countries. the 7.8 magnitude quake and its powerful aftershocks collapsing more than 5,000 buildings. aftershocks are still creating treacherous conditions for rescuers who are trying to reach victims trapped. a massive international rescue effort now under way. and salma abdelaziz is live for us in istanbul. unfortunately the death toll is expected to rise. reporter: it is expected to ric rise. and you have rolling pictures right few on turkish television 24 hours of the search and rescue operations as families listing member after member that is missing. it is those families that turkish authorities are desperate to bring answers to. this is the critical window right now, this is the 24 to 48 hours after the earthquake where there is still a glimmer of hope that th