The United Nations has resumed aid shipments to southern Lebanon. 

The U.N. World Food Program said it sent two convoys carrying food and medicine to the southern coastal cities of Tyre and Sidon. It also sent aid convoys into eastern Lebanon from Syria.

The agency hopes to distribute the aid to civilians stranded by the war between Israel and Hezbollah guerrillas.

The agency said it decided to send the convoys into southern Lebanon after Israel and Hezbollah guaranteed safe passage. 

The U.N. agency also says Israel has refused again to guarantee safe passage for aid convoys to the southern Lebanese town of Rmeish, southeast of Tyre.

More than 700,000 Lebanese have become displaced during the war.

Media reports say Israel has decided to allow international aid to arrive by ship at Beirut's port

Tuesday, the World Food Program and International Committee of the Red Cross said at least six of their aid convoys were unable to continue into southern Lebanon. They said Israel and Hezbollah would not guarantee safe passage.

Some information for this report was provided by AP and Reuters.