Lebanon's official news agency says a Syrian jet has fired a missile that slammed into a house on the outskirts of a Lebanese border town.
The National News Agency says the attack hit the edge of the town of Arsal on the Lebanese side of the frontier on Wednesday. The report said there were no casualties, although the strike did cause material damage.
Lebanon has been on edge since the uprising against Syrian President Bashar Assad began more than two years ago.
Lebanese gunmen supporting opposing sides of the Syrian conflict have frequently clashed in Lebanon, raising concerns that fighting could spread and reignite Lebanon's explosive sectarian mix.
Arsal is a Sunni Muslim town that has backed opposition fighters in Syria. Arms smuggling into Syria is widespread in the area.
On Tuesday a mortar exploded on the Israeli side of the border with Syria in the Golan Heights near Tel Fares. A short time later an IDF patrol near Tel Hazaka in the Golan Heights was hit by small arms fire. No injuries or damages were reported.
IDF tanks fired across the Syrian border at the source of the fire in response. The tanks achieved a direct hit.
The shell is the latest in a series of incidents in which the Syrian civil war has spilled across the border in the form of mortar and gun fire.
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