(Adds army deploys more forces in paragraph 3)

BEIRUT, Jan 14 (Reuters) - The commander of a U.N. peacekeeping force urged Lebanon and Israel to exercise restraint after at least three rockets were fired into northern Israel from Lebanon on Wednesday.

The Lebanese government condemned the attack, the second launched from Lebanon against Israel since it began its offensive in the Gaza Strip on Dec. 27. Information Minister Tareq Mitri said it "gave Israel an excuse to harm the national interest".

The army deployed additional forces in the south to boost its "defensive capabilities", a military source said.

The Lebanese political and military group Hezbollah, which has a minister in the government, did not immediately comment on the attack. The group, which fought a 34-day war with Israel in 2006, denied any role in a similar attack last week. Israeli officials blamed smaller, armed Palestinian factions in Lebanon.

The Lebanese army and members of the U.N. peacekeeping force, known as UNIFIL, also deactivated three rockets rigged to launch an hour after they had been found, the army said.

UNIFIL commander Major General Claudio Graziano urged maximum restraint after the early morning rocket salvo.

He was working with both Lebanon and Israel to maintain the cessation of hostilities, UNIFIL spokeswoman Yasmina Bouziane said in a statement. There had been no claims of responsibility for the rocket attack, she said.

Israel responded with two barrages of artillery fire. There were no reports of damage or injury caused by the Israeli shells, Bouziane said. The rockets fired from Lebanon landed in open areas and caused no damage or injuries, she added.

"At present, we cannot confirm the exact location of the launch area," she said.

There have been no claims of responsibility for the Jan. 8 rocket attack from Lebanon.

The UNIFIL peacekeeping force was expanded as part of U.N. Security Council resolution 1701 which ended the 2006 war between Hezbollah and Israel. The Lebanese army deployed in the south as part of the same resolution. Israeli forces had occupied south Lebanon until their withdrawal in 2000. (Writing by Tom Perry; Editing by Matthew Jones)

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