The U.S. dollar extended slight gains on Thursday as its exchange rates against the euro and pound rose, which demonstrated traders and investors' concern about Britain's divorce deal with the European Union (EU).

With 57 days before Brexit to take place legally, British Prime Minister Teresa May has not secured a Brexit deal and EU officials worry that a no-deal Brexit would pose "underappreciated risk" to the European financial markets, said the Guardian.

British Foreign Secretary Jeremy Hunt said in a TV program on Thursday that Brexit could be delayed as the government may need "extra time" to pass key legislation, describing the Brexit impasse as "a very challenging situation."

In late New York trading, the euro decreased to 1.1444 dollars from 1.1481 dollars in the previous session, and the British pound slid to 1.3111 dollars from 1.3112 dollars in that period. The Australian dollar increased to 0.7264 dollar from 0.7254 dollar.

The U.S. currency stood at 108.87 yen, lower than 108.93 yen of the previous session. The U.S. dollar was up to 0.9946 Swiss franc from 0.9941 Swiss franc, and decreased to 1.3131 Canadian dollars from 1.3148 Canadian dollars.