Sri Lanka, Feb. 24 -- US President Donald Trump's new global tariffs have come into effect at 10% despite a pledge to introduce them at a higher rate.

After the Supreme Court blocked many of his sweeping import taxes on Friday, the president said he would introduce a 10% global rate. He then said on Saturday that the rate would be 15%.

However, according to official documents, the tariffs have been set at the lower rate from Tuesday with no directive to increase the rate issued. The BBC has contacted the White House for comment.

"I think it simply adds to the chaos and mess," said Carsten Brzeski, an analyst with investment bank ING, referring to the fast-changing tariffs and their effects on businesses.

"In terms of uncertainty we're...