Israel carries out Gaza Strip airstrike after militants release incendiary balloons

Fragile truce under threat after attack on the Palestinian enclave and violence amid Jewish ultranationalists parade through East Jerusalem

Israel has launched airstrikes on the Gaza Strip, the first since a truce ended 11 days of cross-border fighting last month, in response to incendiary balloons launched from the Palestinian territory.

The flare-up in violence, a first test for Israel's new government sworn in three days ago, followed a march in East Jerusalem on Tuesday by Jewish nationalists that had drawn threats of action by Hamas, the ruling militant group in Gaza.