an official at the Ministry of Defence中的介词可以用from吗

问题描述

This was later confirmed by a naval official at the Ministry of Defence after the Elkor had returned home.

我在陈述这句的时候将 at 说成了 from，请问此处能将 at 换成 from 吗，如果能，有什么区别？

老师答疑

曹老师：

at the Ministry of Defence 是 confirm 的地点状语。如改为 from 则成了navy official 的定语。