Pakistan, Sept. 10 -- Iran has reportedly resumed assembling ballistic missiles at underground facilities, according to US officials. The Wall Street Journal cited officials familiar with intelligence assessments. They said Iran is using previously stored components for the missile production. The activity reportedly continues despite earlier US and Israeli strikes. Intelligence reports have identified activity at several underground locations in Iran.

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According to the report, Iran is assembling both liquid-fuel and solid-fuel missiles. One location reportedly showing activity is the Khojir missile base in southeastern Iran. US and regional officials said Iran currently relies...