US reaching out to families of missing Americans
The U.S. has started reaching out to the families of Americans missing in Israel as part of its efforts to identify the U.S. citizens who may be among the hostages taken to Gaza by Hamas, according to an official.
But due to the dynamic situation and lack of visibility inside Gaza, the U.S. still can't say how many may be detained.
There's also a level of reluctance from U.S. officials to shine a spotlight on any Americans among the hostages for fear that they might be singled out by their Hamas captors.
Other sources said American officials are working the phones with allies in the Middle East who have leverage over Hamas, encouraging them to pressure the militants to free the hostages.
-ABC News' Shannon Crawford