FILE PHOTO: Members of the media stand beside an electric driven Actros truck at the booth of German truckmaker Daimler Truck at the IAA Transportation fair in Hanover, Germany, September 19, 2022. REUTERS/Fabian Bimmer/File Photo

FRANKFURT (Reuters) -Shares in Daimler Truck and Traton fell on Friday after U.S. President Donald Trump announced tariffs on heavy-duty trucks, adding to trade tensions that have hit the automotive sector hard.

Together with a barrage of tariffs in other sectors, including on pharmaceuticals, Trump said on Thursday the U.S. would impose duties of 25% on imports of heavy-duty trucks from October 1.

Daimler Truck's stock was down 3.3% at 0952 GMT, making it the biggest decliner in Germany's blue-chip index. Shares in Volkswagen-owned Traton, were 2.8% lower.

Citi said a 25% tariff on trucks assembled in Mexico would likely have a 700-800 million euro ($818-$934 million) impact on earnings for Daimler Truck, although the group could be able to absorb around half of that in the near term via price increases.

Neither Daimler Truck nor Traton export to the United States from Europe as they have factories in the U.S. and sites in Mexico that are covered by the USMCA free trade pact.

Analysts at Bernstein said it had not been explicitly said that Trump's announcement would apply to the USMCA-compliant Mexican sites, but that they assumed it to be the case.

"Finally, it's also not clear if the industry-specific tariffs will come on top of the country-based tariffs, although some countries including the EU have negotiated agreements that prevent tariff 'stacking'," the analysts said.

Brussels and Washington in July agreed that almost all goods entering the U.S. from the EU would be subject to a 15% baseline tariff, including cars, and that this would not be added to any existing rates.

Volvo Group, which produces all of its U.S. trucks domestically, said it welcomed the U.S. administration's efforts "to get rid of the comparative disadvantage of producing in the U.S.". Its shares were up 2.9%.

Daimler Truck and Traton both declined to comment.

($1 = 0.8562 euros)

(Reporting by Christoph Steitz, Marie Mannes and Christina Amann; editing by Barbara Lewis)