Iran has resumed its production of ballistic missiles using stockpiled components and working in underground facilities, officials from the US and Middle East familiar with the matter said, eroding what the US and Israel have touted as a major achievement of the war, The Wall Street Journal reports.

Despite heavy attacks on its missile sites and industrial facilities during the initial phase of the war, Iran has been busy assembling liquid-propellant missiles, which have to be fueled just before launch, as well as solid-propellant missiles, which can be stored ready to fire, some of the officials said.