A tanker truck carrying a highly flammable gas exploded after crashing into a truck on a crowded motorway in the northern Italian city of Bologna, killing at least three people. Police said the accident and subsequent blast injured up to 70 people, some with severe burns. Part of the raised motorway collapsed in the fireball, closing down a key route between northern Italy and the Adriatic Coast and other points south, including Florence and the capital, Rome. Footage of the crash showed the tanker slamming into the back of a truck which had stopped in traffic. The tanker immediately caught fire and another truck appeared to hit the tanker from behind. After an unspecified amount of time, during which the motorway was cleared of most other vehicles, the truck exploded, causing part of the bridge to collapse and sending a fireball across eight lanes of the motorway and beyond.