Raids are now thought to have killed 204 people so far in Palestine with the first fatality in Israel reported on Tuesday.
Violence has been ongoing in the Holy Land for the past eight days.
On Tuesday Israel accepted a ceasefire agreement from Egypt but Palestinian militant group Hamas rejected it and continued to fire rockets over the border.
Israeli Prime Minister Benjamin Netanyahu said: "When there is no ceasefire, our answer is fire".
He said he had 'no choice' but to increase strikes.
On Sunday Pope Francis used his address to crowds in St. Peter's Square to pray for peace.
In his Angelus he said: "Lord, help us! Give us your peace, teach us peace, guide us towards peace.
"Open our eyes and our hearts and give us the courage to say 'never again war!'
"With war all is destroyed! Give us the courage to perform concrete gestures to build peace.
"Make us available to listen to the cries of our fellow citizens who ask us to transform our arms into instruments of peace, our fears into trust, our tension into forgiveness. Amen."