Israel warned on Sunday it was widening its range of targets to go after Hamas military commanders.
"The Israeli military is prepared to significantly expand the operation," Israeli Prime Minister Benjamin Netanyahu said.
Israel defended itself against Palestinian militants for a fifth day in row by hitting two media centers in the Gaza Strip.
An Israel Defense Forces spokeswoman told CBN News their goal right now is to cripple the capabilities of terrorist organizations and to defend the people of Israel.
Israel's "Iron Dome" missile defense system has intercepted 267 rockets since Wednesday.
Meanwhile President Obama said America supports Israel's right to defend itself and "no country on earth would tolerate missiles raining down" on its people.