Risks to global growth are growing as the risk of protectionism and the threat of higher US tariffs sap confidence, the European Central Bank said in a regular economic bulletin on Thursday.

"Downside risks to the global economy have intensified amid actions and threats regarding trade tariff increases by the United States and possible retaliation by the affected countries," the ECB said in an assessment, which is largely consistent with its view in its July 26 policy statement.

The ECB added that if all the threatened measures were to be implemented, the average US tariff rate would rise to levels not seen in the last 50 years.

At its meeting two weeks ago, the ECB kept policy unchanged, staying on course to end a €2.6 trillion bond purchase scheme by the close of the year and to raise rates for the first time since the eurozone debt crisis in the autumn of 2019.

It added that even as external risks are mounting, domestic growth appears to be robust and near-term indicators point to a solid and broad-based expansion.