The Biden administration has formally determined that violence committed against the Rohingya minority by Myanmar's military amounts to genocide and crimes against humanity, US officials told Reuters, a move that advocates say should bolster efforts to hold the junta that now runs Myanmar accountable.

Secretary of State Antony Blinken will announce the decision on Monday at the US Holocaust Memorial Museum in Washington, US officials said, which currently features an exhibit on the plight of the Rohingya. It comes nearly 14 months after he took office and pledged to conduct a new review of the violence.

Myanmar's armed forces launched...