<p>JERUSALEM — The Palestinian militant groups Hamas and Islamic Jihad, with their operatives on the run, have increasingly forged a common front against Israel, and there are signs they are also being guided by Lebanese Hezbollah guerrillas.</p>
<p>Days after issuing a joint statement calling for coordinated "resistance" against Israel, the two groups attacked an Israeli army base Friday in the Netzarim settlement in the Gaza Strip, killing three soldiers and reviving heated debate in Israel over whether to hang on to the Jewish enclave.</p>