U.S. President Donald Trump is warning Iran in "better be careful" after Tehran said Sunday it was boosting uranium enrichment beyond the limits set in the 2015 nuclear deal.

Trump made his comment hours after Secretary of State Mike Pompeo tweeted that Iran's decision will lead to "further isolation and sanctions."

"Nations should restore the longstanding standard of no enrichment for Iran's nuclear program. Iran's regime with nuclear weapons would pose an even greater danger to the world," Pompeo wrote.

Britain urged Iran to "immediately stop and reverse" all actions that are inconsistent with the agreement, under which it accepted restrictions on its nuclear program in exchange for relief from economic sanctions.

Reports from Iran say officials may raise the enrichment to 5% -- enough to produce fuel for nuclear power plants, but still far below the 90% needed for building a nuclear weapon. The current cap under the nuclear deal is 3.67%.

Trump pulled the United States out of the nuclear deal last year and re-imposed sanctions on Iran, which have severely crippled the Iranian economy.

Source : VOA News