Beirut, March 17 (IANS): At least four people were killed and seven wounded when a suicide bomber exploded his car Sunday night at Nabi Othman town in eastern Lebanon, the media reported Monday.

The car exploded near a gas station on a main road, Xinhua reported citing the National News Agency.

Initial investigation showed that the explosives used in the suicide attack weighed around 20 kg.

The Al-Nusra front in Lebanon claimed responsibility for the suicide attack, refuting the claim previously made by the Free Sunni Battalion, a fundamentalist Sunni group that said it carried out the attack in retaliation for "the Hezbollah involvement in Syria".

The Al-Nusra front, an Al Qaeda-linked terrorist group, said it has "warned the Iran-linked party in Lebanon that it will pay the price for its aggression against the Sunnis and for fighting in support of the regime of Syrian President Bashar Assad".

In eastern Lebanon, which is dominated by Hezbollah, there have been deadly suicide bombing attacks since the armed movement voiced support for the Syrian government in the three-year war against rebels.

This is the fourth suicide attack in the Bekaa region which is considered the heartland of Hezbollah.