WASHINGTON (AP) — A fatal UPS cargo plane crash during a landing attempt last year was caused by pilots who made a series of errors and should have aborted the landing, the National Transportation Safety Board said Tuesday.

The panel also said the pilots may have been suffering from fatigue, but said more stringent federal rules governing pilot hours wouldn’t have prevented the accident. Such tightened rules are being sought by the pilots’ union and are being resisted by UPS.