Rockets launched from Gaza streak across sky towards Israel

Dozens of militants from the Islamist militant group Hamas have infiltrated southern Israel from the Gaza Strip in a surprise attack.

Israel's defence minister said Hamas had "made a grave mistake and launched a war" against his country.

Earlier, dozens of rockets were launched toward Israel, setting off air raid sirens across the country.

Video footage shows rockets streaking across the sky in Gaza, and the aftermath of strikes on Ashkelon, Israel.