A downed tree rests on a house during the passing of Hurricane Florence in the town of Wilson, North Carolina, U.S. September 14, 2018.

Insurer American International Group said on Thursday it expects third-quarter pre-tax catastrophe losses, net of reinsurance, of between $1.5 billion and $1.7 billion.

"These losses are largely associated with multiple events in Japan, including Typhoons Jebi and Trami, as well as Hurricane Florence and revisions to our loss estimates on the California mudslides," AIG said in a statement.

AIG shares fell about 4 percent in extended trading.