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The UN has abandoned for the day any attempt to get an aid convoy through to south Lebanon, citing security fears.
Children were among the casualties of overnight strikes on Beirut
The decision comes a day after Israel imposed an open-ended curfew on all residents south of the Litani River.
Dozens more Hezbollah rockets have been fired into Israel, as Israel launched fresh raids inside Lebanon.
A draft resolution aimed at ending the fighting, and paving the way for an international peacekeeping force, is still under discussion at the UN.
Imposing its curfew south of the Litani river, Israel said any moving vehicles in the zone - up to 30km (18 miles) inside Lebanon's border - would be destroyed.
Leaflets dropped in Tyre, the biggest Lebanese city south of the Litani river, said operations against what they described as terrorist elements would be escalated with extreme force.
The BBC's Jeremy Bowen in Lebanon says Israel may be using threats to step up military action as a means of putting more pressure on the Lebanese government.
Roads and bridges linking Tyre and the outside world have been bombed, making it almost impossible to get aid in or civilians out.
UN officials in Beirut decided not to even attempt sending a convoy on Tuesday.
It is really very bad - it is getting worse
Christiane Berthiaume
UN World Food Programme
"We decided not to go today because of security concerns," Christiane Berthiaume of the UN's World Food Programme told the BBC News website.
"There has been so much bombing. There is no guarantee of safety. It is really very bad. It is getting worse.
"We have not been able to maintain a rhythm of two convoys per day, but even two would not be enough. A good number would be six."
Israeli Foreign Ministry spokesman Mark Regev told the BBC Israel was trying to co-ordinate aid efforts with the international community but could not assume every lorry was carrying aid rather than weapons.
As attempts to find a diplomatic solution continue, an Arab League delegation is set to push for amendments to the draft UN resolution.
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My heart goes out to the civilians of both Lebanon and Israel who are suffering under this cruel conflict
Brad de Souza, Rome
Send us your comments
They want the text changed to add Lebanon's demand for an immediate Israeli withdrawal - not mentioned in the current draft.
There is also dispute over the wording which currently demands that Hezbollah ends all attacks and Israel only ends "offensive" military operation.
Russia's UN ambassador said Moscow would not agree to any resolution which did not have Lebanese approval.
The UN Security Council, meeting in New York, is not expected to vote on the draft resolution until Wednesday.
In other developments:
* At least six people were killed in the Lebanese village of Ghaziyeh while residents were burying their dead from earlier air strikes, rescue workers said
* Reports said at least 15 people were killed when a predominantly Shia area of Beirut was hit late on Monday
* At least three Israeli soldiers died in clashes with Hezbollah in southern Lebanon on Tuesday, the Israeli military said
* Israel said it was temporarily moving all remaining residents from the city of ***yat Shmona - hit by more Hezbollah missiles than any other town in Israel
* King Abdullah of Jordan, in a BBC interview, said the international community had shown only piecemeal ways of dealing with the Middle East and had no overall strategy
Lebanon has told army reservists to report for duty after the cabinet decided to send 15,000 soldiers to the southern border area once the Israelis pull out.
Israeli Prime Minister Ehud Olmert described the plan as an "interesting step" and said his government would study it.
Nearly 1,000 people, most of them civilians, have been killed in the conflict, the Lebanese government has said. More than 100 Israelis, most of them soldiers, have also been killed.
Children were among the casualties of overnight strikes on Beirut
The decision comes a day after Israel imposed an open-ended curfew on all residents south of the Litani River.
Dozens more Hezbollah rockets have been fired into Israel, as Israel launched fresh raids inside Lebanon.
A draft resolution aimed at ending the fighting, and paving the way for an international peacekeeping force, is still under discussion at the UN.
Imposing its curfew south of the Litani river, Israel said any moving vehicles in the zone - up to 30km (18 miles) inside Lebanon's border - would be destroyed.
Leaflets dropped in Tyre, the biggest Lebanese city south of the Litani river, said operations against what they described as terrorist elements would be escalated with extreme force.
The BBC's Jeremy Bowen in Lebanon says Israel may be using threats to step up military action as a means of putting more pressure on the Lebanese government.
Roads and bridges linking Tyre and the outside world have been bombed, making it almost impossible to get aid in or civilians out.
UN officials in Beirut decided not to even attempt sending a convoy on Tuesday.
It is really very bad - it is getting worse
Christiane Berthiaume
UN World Food Programme
"We decided not to go today because of security concerns," Christiane Berthiaume of the UN's World Food Programme told the BBC News website.
"There has been so much bombing. There is no guarantee of safety. It is really very bad. It is getting worse.
"We have not been able to maintain a rhythm of two convoys per day, but even two would not be enough. A good number would be six."
Israeli Foreign Ministry spokesman Mark Regev told the BBC Israel was trying to co-ordinate aid efforts with the international community but could not assume every lorry was carrying aid rather than weapons.
As attempts to find a diplomatic solution continue, an Arab League delegation is set to push for amendments to the draft UN resolution.
HAVE YOUR SAY
My heart goes out to the civilians of both Lebanon and Israel who are suffering under this cruel conflict
Brad de Souza, Rome
Send us your comments
They want the text changed to add Lebanon's demand for an immediate Israeli withdrawal - not mentioned in the current draft.
There is also dispute over the wording which currently demands that Hezbollah ends all attacks and Israel only ends "offensive" military operation.
Russia's UN ambassador said Moscow would not agree to any resolution which did not have Lebanese approval.
The UN Security Council, meeting in New York, is not expected to vote on the draft resolution until Wednesday.
In other developments:
* At least six people were killed in the Lebanese village of Ghaziyeh while residents were burying their dead from earlier air strikes, rescue workers said
* Reports said at least 15 people were killed when a predominantly Shia area of Beirut was hit late on Monday
* At least three Israeli soldiers died in clashes with Hezbollah in southern Lebanon on Tuesday, the Israeli military said
* Israel said it was temporarily moving all remaining residents from the city of ***yat Shmona - hit by more Hezbollah missiles than any other town in Israel
* King Abdullah of Jordan, in a BBC interview, said the international community had shown only piecemeal ways of dealing with the Middle East and had no overall strategy
Lebanon has told army reservists to report for duty after the cabinet decided to send 15,000 soldiers to the southern border area once the Israelis pull out.
Israeli Prime Minister Ehud Olmert described the plan as an "interesting step" and said his government would study it.
Nearly 1,000 people, most of them civilians, have been killed in the conflict, the Lebanese government has said. More than 100 Israelis, most of them soldiers, have also been killed.
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