Lasers struck four aircraft flying over Phoenix late Tuesday, FAA officials said - the latest incidents in what police described as a "non-stop" battle in the area. The aircraft were headed to the municipal Phoenix Deer Valley Airport - about 20 miles north of the main Sky Harbor Airport - when pilots encountered a green laser. No injuries were reported. A police helicopter flew to the area where the laser strikes were reported but was unable to find the culprit. Officer John Meche, a police pilot with the Phoenix Police Air Support, told NBC News that laser strikes were frequent in the area, saying: "It's non-stop here."