An Israeli strike in Lebanon early on Tuesday targeted Mounir Maqdah, commander of the Lebanese branch of the Palestinian Fatah movement's military wing, the Al-Aqsa Martyrs Brigade, according to two Palestinian security officials.
Maqdah's fate was unknown.
The strike hit a building in the crowded Ain al-Hilweh Palestinian refugee camp near the southern city of Sidon, the sources said.
It marked the first strike on the camp, largest of several Palestinian camps in Lebanon, since cross-border hostilities between Hezbollah and Israel broke out nearly a year ago.