KUALA LUMPUR, Malaysia (AP) — More than four days after a Malaysian jetliner went missing on route to Beijing, authorities acknowledged Wednesday they didn’t know in which direction the plane and its 239 passengers was heading when it disappeared, vastly complicating efforts to find it.

Amid intensifying confusion and occasionally contradictory statements, the country’s civil aviation authorities and the military both said the plane may have turned back from its original route toward Vietnam, possibly as far as the Strait of Malacca on the eastern side of the country.