Rockets fired from Lebanon have struck Israel as long-range missile fire from Gaza continued against the country for a fourth day.

Dividing line: the border between Israel and Lebanon.

Dividing line: the border between Israel and Lebanon.

Israeli military spokesman Lt Col Peter Lerner said the rocket fire struck near Israel’s northern border.

He said the military responded with artillery fire toward the apparent source in southern Lebanon. There were no reports of injuries.

Lebanese security officials said terrorists fired four rockets around 6am local time, and the Israelis retaliated by firing about a dozen artillery shells on the area.

Lebanese troops and United Nations peacekeepers later began searching the area.

That area in southern Lebanon is a stronghold of the Shia terrorist group Hezbollah, which has battled Israel numerous times. However, past fire from Lebanon has been blamed on radical Palestinian factions in the area and Hezbollah has not been involved in the ongoing offensive.

Lt Col Lerner said Israel has suspected that Lebanese terrorists may try to join the fray as Israel exchange fire with Islamic Hamas militants in Gaza.

However, he said it is still unclear whether the most recent attack is “symbolic or something more substantial.”

Gaza militants already have fired more than 550 rockets against Israel in the four-day offensive. Israel’s “Iron Dome” defence system has intercepted most of those aimed at major cities but some have slipped through.

On Friday, one such rocket struck a petrol station in the southern city of Ashdod, setting off a large blaze and sending plumes of smoke into the air. Israeli media reported one person was seriously wounded in the blast.

Air raid sirens sounded once more across the country today, including for the first time in the northern city of Haifa.

In Gaza, an Israeli airstrike hit the home of a known Islamic Jihad terrorist leader.

An Israeli border policeman surveys the damaged caused to a structure after it was hit by a rocket near the Gaza Strip border.

An Israeli border policeman surveys the damaged caused to a structure after it was hit by a rocket near the Gaza Strip border.

Gaza health officials said five people were killed in the strike, raising the death toll there to at least 90, including dozens of civilians.

Lt Col Lerner said the military was doing its utmost to prevent civilian casualties, calling inhabitants ahead of time to warn of an imminent attack.

He said Israeli forces also fire “non-explosive munitions” at roofs as a warning and looks for people to leave before destroying a structure.

Israel launched the Gaza offensive to stop incessant rocket fire. The military said it has hit more than 1,100 targets already, mostly what it identified as rocket-launching sites.

He said it was Hamas itself that was responsible for the death of innocent bystanders by firing from heavily populated areas.

Israel’s military “uses its weapons to defend its civilians. Hamas uses its civilians to defend its weapons,” he said.