The US is sending three US Navy ships to the eastern Mediterranean Sea for the possible evacuation of Americans out of Israel, CNN reports.
CNN quotes two unnamed US officials as its source.
The officials say evacuation by sea is unlikely, as most Americans are leaving via commercial airlines if they want to get out.
Earlier on Monday, US President Barack Obama called both Israel Prime Minister Benjamin Netanyahu and Egyptian President Mohammed Morsi to discuss the violence in Gaza.
Obama, who made the calls from Cambodia where he is attending a summit, emphasised to Morsi the "necessity of Hamas ending rocket fire into Israel", according to a White House statement.
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In his conversation with Netanyahu, he received an update on the situation in Gaza and Israel.
