UPDATE | Volkswagen CEO steps down, takes responsibility for scandal

BERLIN (AP) — Volkswagen CEO Martin Winterkorn stepped down today, days after admitting that the world's top-selling carmaker had rigged diesel emissions to pass U.S. tests during his tenure.

In a statement, Winterkorn took responsibility for the "irregularities" found in diesel engines but said he was "not aware of any wrongdoing on my part."

"Volkswagen needs a fresh start — also in terms of personnel," he said. "I am clearing the way for this fresh start with my resignation."

Winterkorn's statement followed a crisis meeting of the Volkswagen supervisory board's executive committee. Its acting chairman, Berthold Huber, told reporters moments later that company directors are "resolved to embark with determination on a credible new beginning."

There was no immediate decision on a new CEO. Huber said that will be discussed only at a board meeting on Friday.

Winterkorn said VW must continue providing "clarification and transparency."

"This is the only way to win back trust. I am convinced that the Volkswagen Group and its team will overcome this grave crisis," he added.

VW shares were up 8.7 percent at 121 euros following his resignation.