"A bomb placed in a BMW in Sidon detonated, wounding Hamas official Mohammed Hamdan", a military source said on Sunday.
Mohammed Hamdan, a senior official in the Palestinian movement Hamas was reportedly wounded in an explosion of a auto on Sunday.
According to security sources the targeted official was Mohamed Hamdan, who's also known as Abu Hamza.
Hamas did not immediately issue a statement on the blast.
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Hamdan was transferred to hospital, while security forces cordoned the area and firefighters rushed to the scene.
Local media reported that Hamas had released a statement denying that any of its officials had been killed in the attack.
Tens of thousands of Palestinian refugees live in Lebanon, many of them in 12 camps across the country. The explosion took place at his home, near Sidon's Al-Bustan Street.
These units - which include Hamas and rival Palestinian faction Fatah - have fought several battles with other groups inside Ain al-Hilweh.