A pair of Israeli airstrikes targeted senior Islamic Jihad commanders in Gaza and Syria early Tuesday, escalating Israel’s confrontation with Iran across the region and threatening to unleash another devastating round of cross-border violence with Palestinian militants. In eastern Gaza, the Israeli strike killed Bahaa Abu el-Atta and his wife, setting off a furious barrage of Gaza-fired rockets that reached as far as the Tel Aviv heartland as Islamic Jihad vowed further revenge.