BRUSSELS - NATO on March 31 warned Libyan forces they would be  "ill-advised" to kill civilians as the alliance took sole command of air  strikes that were under U.S. leadership.

 Libyan rebels drive   toward the city of Brega on March 31, en route to a battle with forces  loyal to Libyan leader Moammar Gadhafi.   (Mahmud Hams / Agence  France-Presse) 
An armada of ships and  warplanes from the United States, France, Britain, Canada and other  coalition nations came under NATO control after the 28-nation military  organization overcame internal divisions to take over the mission.
U.S., British, French, Canadian, Danish and Belgian jets  have attacked Moammar Gadhafi's ground forces since March 19 under a  U.N. mandate to use "all necessary measures" to protect civilians.
Canadian  Lt. Gen. Charles Bouchard, commander of Operation Unified Protector,  said NATO aircraft had flown 90 missions since the alliance took charge  at 0600 GMT March 31. 
"Those who are acting against the civilian  population and civilian centers, you would be ill-advised to continue  such activities, I recommend that you cease these activities," Bouchard  told reporters via video link from his headquarters in Naples, Italy,  stressing that NATO would remain "impartial."
The United States,  already stretched after a decade of combat in Afghanistan and a fragile  situation in Iraq, had been eager to hand over control of the operations  to someone else.
NATO Secretary-General Anders Fogh Rasmussen  said the alliance will be able to declare "mission accomplished" when  "the civilian population in Libya is not under threat any longer."
But  he acknowledged it was impossible to know when this would happen, and  he stressed that a political solution, not just military means, was  needed to resolve the conflict.
"I urge all parties to seek a  political decision sooner rather than later and ensure a political  transition to democracy. But I'm not able to lay out a timetable," he  said at a conference in Stockholm.
The alliance stressed it would  stick to the U.N. mandate to shield civilians, as Rasmussen reiterated  his opposition to arming the rebels.
The head of NATO's military  committee, Italian Adm. Giampaolo Di Paola, said there was no discussion  about deploying troops. He also denied that NATO was coordinating its  operations with the rebels.
Asked about reports that the CIA was  on the ground in Libya, Di Paola said NATO does not question the source  of intelligence it receives from allies.
Di Paola said he expected  some 20 NATO allies to provide assets for one or all three operations  under alliance control - the strikes on ground forces threatening  civilians, a no-fly zone, and an arms embargo.
But key NATO members have voiced unease about the bombing missions.
Bouchard  vowed that NATO pilots would conduct their missions "with care and  precision" in order to "avoid harming the people of Libya."
The  general launched a probe into allegations made by a Tripoli-based  Italian bishop that dozens of civilians were killed during coalition  bombings.
No date was given for the incident, which could not be independently verified.
Turkey,  NATO's sole Muslim member, criticized the scope of the coalition  strikes and has made clear its planes would not take part in any  airstrikes.
Another major NATO member, Germany, refused to vote  for the U.N. Security Council resolution that authorized the use of  force and will stay out of the offensive operations.
The  Netherlands has contributed planes but they will only participate in  maintaining a no-fly zone to prevent hostile jets from flying, not the  strikes against other targets.
NATO wants to bring outside  partners into the mission, especially Arab nations. Qatar and the United  Arab Emirates are the only Middle Eastern nations to have provided  jets.
Sweden, a NATO partner but not member, offered fighter jets but said it would not conduct ground strikes.