North Korea has produced enough fissile material to build up to 90 nuclear warheads, and may have already assembled approximately 50 of them, according to a new report by the U.S. Congress’ think tank.

The report, published Friday, updates the Congressional Research Service’s (CRS) assessment of “North Korea’s Nuclear Weapons and Missile Programs” to reflect new estimates from non-governmental experts that indicate a significant increase in North Korea’s fissile material stockpile. 

A CRS assessment published in 2023 estimated enough material for 20 to 60 warheads, while another released last year reportedly gave the same figure.

Citing the U.S.