Israeli warplanes struck the seaport in Tripoli, which is Lebanon's second largest city, said the sources, adding that a second missile hit a fishing port north of Tripoli. There was no immediate report on casualties.

Earlier in the day, 16 Lebanese civilians were killed and dozens of others wounded in an Israeli air strike on a building in the southern Lebanese port town of Tyre.

Israel continued a five-day-old assault in Lebanon on Sunday after the Lebanese Shiite militant group Hizbollah seized two Israeli soldiers and killed eight in cross-border clashes on July 12.

In a separate incident, at least seven people including five holding dual Lebanese and Canadian citizenship were killed in an Israeli raid on a southern Lebanese village.

Meanwhile, eight Israelis were killed and dozens more injured in a Hizbollah rocket attack on the northern Israeli city of Haifa. Israeli Prime Minister Ehud Olmert has vowed "far-reaching consequences" for the deadly attack while Hizbollah chief Hassan Nasrallah said the fight against Israel had just began.