Jerusalem (CNN) Gaza militants fired five projectiles toward Israel on Saturday night, the Israel Defense Forces said, in apparent violation of a ceasefire agreed to by Hamas and Islamic Jihad earlier in the week.

Four of the launches were intercepted by Israel's Iron Dome aerial defense system, while the fourth landed in Gaza, the Israeli military said.

In response to the initial fire by militants -- which consisted of two rockets -- the Israeli air force launched strikes on 10 Hamas targets in Gaza.

Among the targets were two munitions manufacturing and storage sites, the Israeli military said, as well as a military compound.

The exchange of fire comes less than five days after the biggest flare-up in fighting since the end of the last war between Israel and Hamas, four years ago.

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