Anchor Diane Sawyer to step down from ABC World News show

ABC News has said star journalist Diane Sawyer is stepping down from anchoring its flagship evening news show ABC World News to focus on television specials.

Sawyer will be replaced by David Muir from September 2. He is currently the anchor of current affairs show 20/20, the Walt Disney Co-owned broadcaster said in a statement.

ABC also said George Stephanopoulos, a former White House spokesman during the Clinton administration, would leave Good Morning America to become chief anchor of ABC News, handling special reports and breaking news.