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 told Reuters.
"The Israeli raid targeted the house of the son of Mounir Maqdah," AFP quoted a Palestinian camp official as saying, requesting anonymity to discuss sensitive matters. It was unclear if Maqdah was at the property.
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.