Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Libyan Rebels Accuse NATO of Failing to Carry out Airstrikes VOA News April 06, 2011 Libyan rebels retreat followed by incoming shells fired by pro-Gadhafi forces along the front line near Brega, Libya, April 5, 2011 Photo: AP Libyan rebels retreat followed by incoming shells fired by pro-Gadhafi forces along the front line near Brega, Libya, April 5, 2011 The head of Libya's rebels forces has criticized NATO for failing to quickly carry out airstrikes in the western city of Misrata, saying the delay was causing civilian deaths. Abdel Fattah Younes said NATO was moving very slowly, allowing forces loyal to Libyan leader Moammar Gadhafi to advance. He said he may urge rebel leaders to take opposition grievances to the United Nations Security Council, which authorized force in Libya to stop government troops from harming civilians. NATO officials say air power over Libya is undiminished but that Gadhafi has been using civilians as human shields and hiding his armor in populated areas. Brigadier General Mark van Uhm, chief of allied operations, said that in Misrata, the alliance has "absolute confirmation" that tanks are being dispersed and humans used as shields "in order to prevent NATO sorties to identify and target those assets." Rebel officials disputed Van Uhm's claim that civilians are present in all areas where pro-Gadhafi forces are positioned. NATO spokesperson Oana Lungescu said Tuesday that "the pace of operations since NATO took over has not abated." The alliance reported that coalition airstrikes have destroyed 30 percent of Libya's military while enforcing the U.N.-authorized no-fly zone aimed at protecting civilians. The rebels accusations came as forces loyal to Gadhafi forced them into their biggest retreat in several days during fighting near the key eastern oil town of Brega. Both sides exchanged heavy fire on Tuesday, one day after rebels had taken over a residential part of the city. U.S. envoy Chris Stevens met with members of the opposition Transitional National Council Tuesday in Benghazi to better understand who the rebels are and what they need. Qatar, France and Italy have already granted official recognition to the rebel administration. Meanwhile, diplomatic efforts to end the conflict continue. Libyan envoy Abdul-Ati al-Obeidi ended a shuttle mission to Greece, Malta and Turkey after setting out Libya's official position. The government said Tuesday that Obeidi has been appointed to replace Moussa Koussa as foreign minister after the close Gadhafi ally defected to Britain. Both rebel and Western leaders say they will not accept any deal that allows Gadhafi or his sons to stay in power. Some information for this report was provided by AP and Reuters. .