The raids come after a Hezbollah rocket attack killed eight Israelis in Haifa.
Israeli Prime Minister Ehud Olmert warned that the Haifa attack would have "far-reaching consequences".
More than 130 Lebanese have died since clashes with Israel began last week. At least 23 people were killed in air raids in southern Lebanon on Sunday.
Early on Monday, Israeli air strikes targeted Tripoli, Lebanon's second-largest city located in the north of the country, and Baalbek in the east.
The target in Abdeh was about 6km (four miles) south of the border with Syria.
Ten Lebanese soldiers were reported injured in the strike that killed eight of their colleagues.
The Israeli military said it had been targeting radar stations in Abdeh because they were used by Hezbollah to hit an Israeli ship on Friday, the Associated Press news agency reported.
At least six other people were reported killed in Israeli raids in central and eastern Lebanon.
Twelve Israeli civilians have been killed by Hezbollah rockets since fighting began on Wednesday, including the eight killed in Haifa.
The Israeli air strikes began after Hezbollah seized two Israeli soldiers during a raid into Israel on Wednesday.
In other developments:
- The Israeli army said Hezbollah rockets fired from Lebanon have struck deeper into Israel than ever before, hitting the town of Afula, 50km (33 miles) south of the border, and the outskirts of Nazareth
- Israeli air strikes late on Sunday set fuel tanks ablaze at Beirut's international airport
- Hezbollah leader Hassan Nasrallah said the battle against Israel was "just at the beginning", in his first televised appearance since the offensive
- Iran's foreign ministry denied Israeli allegations that it supplied missiles to HezbollahTop European Union and United Nations officials have arrived in Beirut for talks on the crisis.
After meeting Lebanon's Prime Minister Fuad Saniora, the European Union Foreign Policy chief Javier Solana appealed for an end to the violence and the release of two Israeli soldiers being held captive by Hezbollah.
EU foreign ministers will discuss the crisis at a meeting in Brussels on Monday.
Meanwhile, leaders of the G8 nations have blamed extremist forces for the crisis, while calling on Israel to end military operations.
At least 16 died in Israeli air strikes on Sunday the city of Tyre, while attacks on a border village killed seven Canadians of Lebanese origin who were on a family holiday. Canada said it had begun organising evacuation plans for the estimated 40,000 Canadians in Lebanon.
The strikes came hours after the Haifa rocket attack, which killed eight members of a train repair crew.
Correspondents say the large death-count in a strike on Israel's third-largest city has rattled the whole country.
Israel's death toll from the fighting stands at 24 overall.
Israel has carried out a heavy bombing campaign across Lebanon, hitting Hezbollah sites, but also a wide range of civilian targets.
US security teams have landed at the US Embassy in Beirut to start planning the evacuation of Americans.
Foreign nationals have been leaving Lebanon to escape the violence.
As the violence has escalated the number of locals attempting to flee has grown, but with the Israelis targeting the border areas and nearby roads, this has become increasingly difficult.