"An Israeli strike targeted a Hamas movement security official from the Ain al-Helweh camp while he was inside his vehicle in the city of Sidon," the source said, requesting anonymity as they were not authorised to speak to the media.

An AFP correspondent saw emergency personnel pull a charred body from the vehicle while soldiers cordoned off the area.

Hours earlier, an Israeli strike killed two Hezbollah fighters near the Lebanon-Israel border, according to sources close to the Lebanese group and Israel's military.

Hezbollah in separate statements Friday said two of its fighters were "martyred on the road to Jerusalem", the phrase it uses to refer to fighters killed by Israeli fire.

A source close to the Lebanese movement, requesting anonymity, said the pair were killed "in an Israeli strike in Naqura".

The Israeli army said it targeted two Hezbollah fighters as they were leaving a “military structure” in the Naqura area, and that air forces “eliminated” the operatives.

Lebanon’s National News Agency also reported Israeli strikes on several locations in southern Lebanon on Friday.

Israel has repeatedly targeted Hamas and Hezbollah officials in Lebanon since the Gaza war erupted 10 months ago.

A strike in January, which a US defence official said was carried out by Israel, killed Hamas deputy leader Saleh al-Aruri and six other fighters in Hezbollah's south Beirut stronghold.

In March, Hamas said one of its members was killed in an Israeli strike in south Lebanon that state media said killed three people.

In May, Hamas said a "commander" was killed in an Israeli strike on an eastern district of Lebanon near the Syrian border.

Ten months of cross-border violence has killed some 561 people in Lebanon, most of them fighters but also including at least 116 civilians, according to an AFP tally.

On the Israeli side, including in the occupied Golan Heights, 22 soldiers and 26 civilians have been killed, according to army figures.

The violence has displaced more than 102,000 people in Lebanon, the International Organization for Migration said on Thursday, with tens of thousands also displaced across the border in Israel's north.

*This story was edited by Ahram Online.