Israel refused and responded with airstrikes and artillery fire on targets in Lebanon. Early observation helicopters were effective at calling for artillery fire and airstrikes. Israel responded with airstrikes against Iranian bases in Syria. Israel also practices deliberate ambiguity over the issue of targeted killings and airstrikes. U.S. airstrikes and a relief force lifted the siege. On 21 April, Haftar launched several airstrikes and explosions were launched over Tripoli. Beirut's southern suburb was heavily damaged by Israeli airstrikes. On February 16 at dawn Egyptian military conducted airstrikes on ISIL facilities in Libya. Osa were used, and some destroyed during the 2011 Libyan Civil War by NATO airstrikes. By the end of 2018, Airwars, which monitors reports of casualties of all airstrikes. Three coalition airstrikes hit Sa'ada on Monday. They also report the sinking of enemy shipping by airstrikes and weapons of mass destruction. The coalition had some heavy weapons and was supported by intense US led airstrikes. Russian airstrikes against targets within Georgia were also launched. Residents reported that 60 Islamists died in the Gao airstrikes.