WASHINGTON/ZURICH (Reuters) -Swiss President Karin Keller-Sutter left Washington empty-handed on Wednesday after a hastily arranged trip to avert a crippling 39% tariff on the country's exports to the United States, its biggest market, three sources familiar with the matter said.

After weeks of working with U.S. officials to try to avoid hefty tariffs on Swiss goods, negotiators from Switzerland got assurances that a deal was all but done. Swiss businesses vowed to pour tens of billions in investment in the United States in the coming years.

The Swiss government said it had “no indication” the country would be hit with a 39 percent tariff, which is set to take effect this week.