DUBAI, June 19 (Reuters) - Israeli strikes on southern Lebanon killed at least 15 people on Friday, state news agency NNA said, while Israel said the attacks launched overnight were aimed at what it described as Hezbollah targets in several areas. Residents and domestic media said Israeli airstrikes and shelling hit several towns in the Nabatieh district overnight and into early Friday, in a bombardment that NNA said was among the heaviest in recent weeks.