Israel Defense Forces said the airstrikes -- going after 15 Hamas targets -- were in response to the firing of more than 20 rockets into Israel since Wednesday.

This is in addition to other actions -- including the arrests of hundreds of Hamas activists, the demolition of homes and the closure of dozens of institutions in Gaza, according to Netanyahu -- targeting Hamas and focused in Gaza. This action follows the abduction of Israeli teens Eyal Yifrach, Gilad Shaar and Naftali Frankel as they were on their way home from school June 13; the three were found dead on Monday in a West Bank field.

Hamas praised the kidnappings but denied that it was responsible for what happened. It warned that if Netanyahu "brings a war on Gaza, the gates of hell will open to him."

At the teens' funerals, Netanyahu said the country would avenge their deaths at "the hands of evil men."

"A broad moral gulf separates us from our enemies," he said. "They sanctify death; we sanctify life. They sanctify cruelty and we mercy and compassion. That is the secret of our strength."