The Swiss franc firmed against the dollar and the euro in early trade on Monday after security warnings from the United States and after Swiss data on Friday signalled continued robust growth ahead for the Alpine economy.
The dollar eased to 1.2745/50 francs compared to levels around 1.2780 late on Friday in Europe. The euro traded at 1.5372/82 francs compared with levels around 1.5390.
Intelligence warnings of al Qaeda threats to attack the New York Stock Exchange, World Bank and International Monetary Fund prompted the United States on Sunday to issue a "high" level threat alert for financial institutions in New York and Washington.
The news put pressure on the dollar and accentuated the franc's safe-haven qualities - it tends to rise in situations of political or economic unrest.
Data on Friday showed that Switzerland's export-dependent economy remained on track for solid growth in the months ahead, with the July KOF leading indicator coming in above economists' forecasts.
Players in the Swiss market were looking ahead to the July Purchasing Managers' Index later in the session for signs that the industrial sector has expanded further.
Consumer price inflation data for July are due on Tuesday, while July jobless figures will be released on Friday.