The UN's aid chief has warned against blurring the lines between military operations and relief work in Libya.
Valerie Amos said there was no need yet to accept an EU offer of military escorts to protect aid deliveries.
Meanwhile, Oscar-nominated Tim Hetherington was one of two Western photojournalists killed in a mortar attack in the besieged city of Misrata.
Another journalist said they were among a group pulling back from the front line when they came under fire.
Spanish photographer Guillermo Cervera, who was with the group, told the BBC that he and the other reporters "were coming backwards because we were scared of the fight" when they were caught in the attack along Tripoli Street.
Hetherington, 41, a photojournalist and Oscar-nominated filmmakerwith dual British and American nationality, died instantly. He had covered a number of conflicts, including the war in Afghanistan.
Chris Hondros, an American photographer for Getty Images, died of his wounds several hours later.
'Impartial aid'
Inspired by uprisings in neighbouring Tunisia and Egypt, Libyan rebels have been fighting Col Gaddafi's forces since February.
The rebels, based in Benghazi, hold much of the east, while Col Gaddafi remains in control of Tripoli and most of the west.
Ms Amos spoke after Britain, France and Italy said they would send small teams of military advisers to rebels fighting to topple Col Gaddafi.
"Our responsibility, all the time, is to ensure that our aid is offered on an impartial basis," she said.
Military escorts could put aid workers and the delivery of their aid at risk, she said.
"We have to be extremely careful about that and make sure the lines are not blurred."
Humanitarian supplies were reaching both sides in the conflict, she said.
Speaking at the UN in New York after a visit to Libya, Ms Amos said the Libyan authorities had agreed to secure aid workers in conflict zones and ensure they got through government roadblocks.
But without agreement on a ceasefire, access to places such as Misrata would be determined by the intensity of the fighting, she said.
If the security situation became impossible, Ms Amos said, then the UN would call on the EU for military support for its aid deliveries.
She did not directly address the decisions by Britain, France and Italy to send teams of about 10 military advisors each to the rebels.
The British team will provide logistics and intelligence training in Benghazi. UK Foreign Secretary William Hague said it complied with the UN mandate authorising "all necessary measures short of occupation" to protect civilians.
UN Security Council resolution 1973 also authorised Nato to enforce a no-fly zone over Libya.
Late on Wednesday, Libya's official Allibiya TV reported that Nato forces fired several missiles at the Khallat al-Farjan district of the capital, Tripoli.
Copyright © 2011 BBC News.
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