Explosions were heard near Israel's northern border with Lebanon on Thursday, witnesses and AFP correspondents said, as Lebanese security sources said militants had fired four rockets into Israel.

Witnesses reported hearing several blasts near the northern coastal town of Nahariya.

No casualties or damage were immediately reported.

"We heard about four or five explosions, and then the sirens went off for about a minute," a woman named Yasmin from the northern village of Klil told AFP.

A security source in Lebanon said that four rockets were fired at Israel from the south.

"Unknown gunmen fired four rockets from two positions, south and east of Tyre, at Israel," the source said as residents in the area said they heard four blasts.

The Israeli army said the Iron Dome defence system intercepted one rocket.

"One rocket was intercepted by Iron Dome," an army spokeswoman told AFP, without specifying its location or giving any details about the other rockets.

No casualties or damage were immediately reported.

Israeli police urged residents of the north region to remain close to bomb shelters.

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