Jerusalem: A volley of rockets fired from Lebanon slammed into Israel on Wednesday, prompting the Israeli military to return fire and raising new tensions in an already volatile region.

An obscure Islamist group claimed responsibility for the rocket fire, the first such attack in two years, which comes amid fears that unrest rocking Syria could spill over into Lebanon, or provoke new conflict with Israel.

In a statement, the Israeli military said "a number of rockets" landed in the western Galilee region without causing any casualties and that Israeli troop "responded by targeting the origin of the fire."

Israeli media reported that a total of four Katyusha rockets hit the area, including one that struck a gas tank and caused a fire.

In Lebanon, a military spokesman said at least one rocket was fired from the region of Rumaysh, and at least four Israeli rockets were fired in response.

The UN peacekeeping force in Lebanon (UNIFIL) also confirmed the attack and urged maximum restraint to prevent an escalation.

"UNIFIL radars detected firing of at least one rocket into Israel shortly after midnight last night from the general area of Rumaysh in south Lebanon," it said in a statement.

UNIFIL commander Major-General Alberto Asarta Cuevas said the attack was clearly aimed at undermining stability in the area.