Iranian attack in Iraq is a deflection move by
Guthrum 8 Jan 2020 13:46Extremely unlikely to have been a 'stray' ballistic missile, chances of that are miniscule. Timing also does not match that of the known missile strikes.
An over-enthusiastic/jumpy fighter controller or commander of an anti-aircraft missile battery, on the other hand, is quite a likely scenario (happened with MH17, the Vincennes incident and KAL007).