Authorities are backtracking from earlier report wreckage of EgyptAir Flight 804 had been found. Egyptian authorities Thursday were still trying to determine the cause of a passenger jet’s disappearance over the Mediterranean Sea with 66 people aboard, not ruling out mechanical failure but as the hours passed, saying terrorism was probably at play.

One key reason? The plane’s sharp jerk off course and subsequent nosedive toward the ocean seemed most likely to have been caused by interfering hands on the controls, one aviation security expert told Fox News. The plane jolted 90 degrees to the left, then a full circle to the right, before plummeting toward the ocean off the coast of the Greek island of Karpathos, shortly after 3 a.m., various media reported. READ MORE