Debris is pictured strewn across the A40 which has been closed in both directions after the multi-vehicle crash.
The collisions stretched for more than half a mile near Witney in Oxfordshire.
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Police chief Kristen Ziman said that the officers were shot at as soon as they entered the Henry Pratt company building in Aurora.
The footballer had just signed for Cardiff City in a record transfer deal.
The 36-year-old was attacked in January.