Israeli military jets and helicopters are reported to have flown over Lebanon's Bekaa valley this evening but it is unclear if they have fired missiles.
One report said the planes did not launch an attack.
It said they had come under anti-aircraft fire, but had not been hit and had not opened fire themselves.
The Israeli army denied its warplanes had launched air strikes.
UN & US urge Europe to send troops
The United Nations and the United States have urgently appealed to Europe to provide peacekeepers for Lebanon.
Around half a dozen countries have so far offered troops. However, European powers expected to have provided key contributions have been reluctant to give firm pledges for the 3,500-strong vanguard, due to be on the ground in ten days.
The UN made no attempt to disguise its disappointment after France announced it would send only 200 extra troops to the UN force.
The US and France together drafted the UN resolution that outlines the force's mandate and deployment.
Speaking to journalists, the UN's Deputy Secretary General, Mark Malloch Brown, said it was very important that Europe step forward.
Mr Brown said the ceasefire could not be expected to hold indefinitely without a strong UN force on the ground.
US President George W Bush said he hoped that Paris would increase the size of its pledge.
Many European countries, including France, are worried that they could end up in the middle of the conflict between Hezbollah and Israel.
The French MP Jacques Myard, who is a member of the French Assembly's foreign affairs committee, said only the United Nations could decide the rules of engagement.
Government ministers and Irish military chiefs are said to be still taking a 'cautious approach' on the issue of deploying Irish soldiers to the expanded UNIFIL force.
There had been speculation in recent weeks that Ireland might be prepared to send about 120 troops to join the expanded UNIFIL force.
It had been envisaged that the Irish would act as an armoured infantry company as part of an international rapid reaction force.
A Defence Forces spokesman said there would not be any announcement in the near future about sending Irish troops to the region.
Germany has ruled out contributing ground troops but has proposed sending a 'maritime protection component' to Lebanon.
Hezbollah distributes cash
Meanwhile, Hezbollah has begun distributing up to $12,000 in cash to families whose homes were destroyed by Israeli air strikes in southern Beirut.
The group said it had compensated 120 families so far.
The money is intended to help victims of the bombings rent a flat for a year and furnish it.
Hezbollah has not said where the funds are coming from to compensate people from an estimated 15,000 destroyed homes, which could cost at least $150 million.
Lebanese force deployed
Lebanese troops took up position in the heavily bombed border town of Khiam this morning, 7km from the Israeli border.
The town, which was the site of a notorious Israeli prison during its 22-year occupation of the region, had been a Hezbollah stronghold since Israel last pulled out in 2000.
The Lebanese troops are charged with policing the ceasefire between Hezbollah and Israel until the full peacekeeping force stipulated by the UNSC resolution can be deployed.
At least 1,110 people in Lebanon and 157 Israelis have been killed in the conflict that erupted after Hezbollah captured two Israeli soldiers in a cross-border raid on 12 July.
