The IDF shelled the areas in southern Lebanon from which Katyusha rockets were fired at Israel's north Thursday morning. There were no initial reports of injuries.
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Military sources estimated that the attack was carried out by a Palestinian organization and not by Hizbullah, in light of the type of rockets used.
However, Rafat Mora, a Hamas spokesman in Lebanon, said Thursday that his organization was not involved in the Katyusha fire.
"We are not accusing any of the Palestinian factions of the shooting and we don’t know who fired on Israel."
The Northern Command convened for an urgent meeting to evaluate the situation, and will discuss the possibility that the region could flare up if the armed groups in Lebanon decide to launch attacks to show their solidarity with the Palestinians in Gaza.
Senior intelligence officers, headed by IDF Intelligence chief Amos Yadlin, warned this week that Hizbullah or another pro-Palestinian Lebanese organization might attempt to open a second front against Israel in light of the fighting in the Strip.
The army is preparing for two possible scenarios in the region: The first – an attempt to carry out an attack on the border fence; and the second – Katyusha attacks on Israel.
Following these estimates, the army has recently decided to raise the alert level in the north and boost forces on the border.
The possibility for an escalation in the north was also taken into consideration during the massive reserve call-up held about a week ago. Some of the reserves have trained at the Northern Command's training base and are ready to take part in the fighting should the situation deteriorate.
Sharon Roffe-Ofir contributed to the report
At least four Katyusha rockets were fired into northern Israel from Lebanon, injuring at least five people. The rockets landed just six miles from the Israel-Lebanon border in the Israeli city of Nahariya.

Katyusha rocket 
Following the attack, the Israeli military fired at least five mortars into Lebanon in an attempt to take out the launch site. No one was injured. So far no group or individuals have claimed responsibility for firing the rockets. Some news reports speculate that the rockets may have been fired by Hezbollah, but ''PressTV'' reports that Hezbollah was not responsible for Thursday's attack. 

''Ynetnews'' says that the rockets were fired by Palestinians, but Hamas, the Palestinian leadership who Israeli is currently engaged in a war with, says that they are not responsible for the attacks. Hezbollah has also denied being responsible for the attack.


"We cannot blame any Palestinian faction and we don't know who fired the rockets," said Raafat Morra, a Hamas spokesperson as quoted by the ''Straits Times'' who quotes ''AFP''. "Hamas is pursuing its combat inside Palestine and our principle is not to use any other Arab soil to respond to the occupation."

''PressTV'' also states that Israeli warplanes have began to fly over Southern Lebanon.

In 2006, Israel bombed targets inside Lebanon after Hezbollah attacked Israeli army patrols and captured two Israeli soldiers in a mission Hezbollah called "Truthful Promise". Hezbollah had fired nearly 4,000 rockets into Northern Israel prior to kidnapping the soldiers. The conflict lasted nearly 40 days.

The leader of Hezbollah, Seyyed Hassan Nasrallah said on January 7 that any  attempt at another war with Lebanon "would be nothing compared to what we Hezbollah have in store for them Israel."

As a result of Thursday's attack, Israel says that they will attack Lebanon with the same style of attacks that are being forced onto the country.