Washington, March 23 -- US President Donald Trump says he has ordered the withdrawal of recently imposed sanctions against North Korea.

In a tweet on Friday, Trump referred to "additional large-scale sanctions" by the US Treasury that had been added to already existing restrictions.

It was not immediately clear which measures he was referring to, the BBC reported.

However on Thursday, the US Treasury blacklisted two China-based shipping companies for reportedly violating sanctions against North Korea.

US National Security Adviser John Bolton described the treasury sanctions at the time as "important".

In a tweet, he wrote that "the maritime industry must do more to stop North Korea's illicit shipping practices".

The US Treasury said i...