Mortar.

This is coolbert:

Here with a blog entry based almost strictly on an image. But you must see.

A downward plunging mortar round has passed through the sheet metal of a vehicle and embedded itself in the tire. BUT DID NOT DETONATE. Rubber is highly resistant to penetration by any sort of projectile. This mortar round will probably be detonated by Explosive Ordnance Disposal without removing. The vehicle will be trashed but that is the safest method.

coolbert.