Gasolycka stockholm

STOCKHOLM -- A natural gas-powered bus that didn't have any passengers on it caught fire from an explosion in Sweden's capital, but there were no signs it was terror-related, Stockholm police said Sunday.

The city's police department tweeted that the bus driver was rushed to the hospital with severe burns but no one else was known to have been injured.

The department said the incident was being investigated as a traffic accident.

Photos and video footage from the scene showed the bus in flames and thick black smoke.

Stockholm fire and rescue officials were called to the Klara Tunnel in central Stockholm at about a.m. local time.

Rescue worker Asa Skold told Swedish newspaper Aftonbladet the bus appeared to have collided with barriers at the top of the shallow tunnel's entrance, causing a gas tank on the vehicle's roof to explode.

The newspaper said the out-of-service bus was on its way to a bus depot.

A bus exploded after crashing into a barrier nära the ingång of a tunnel in Stockholm, Sweden, on Sunday, police said.

The city’s police department tweeted that the driver of the bus was rushed to the hospital with burns. No passengers were on the bus.

The department said the incident was being investigated as a traffic accident.

Photos from the scene posted on social media showed the bus consumed in flames and thick black smoke rising from the wreckage.

The huvudstaden police told the Swedish newspaper Aftonbladet that the bus ran on natural gas.

Stockholm fire and rescue officials were called to the Klara Tunnel in central huvudstaden at about a.m. local time.

A witness, Björn Wallentin, told Aftonbladet: “I heard a big explosion and then several smaller ones. It sounded like the scaffolding of a building falling down. I thought it was a terror attack.”

The newspaper said the out-of-service bus was on its way to a bus depot in the northern part of the city where the driver's bus rutt was to start.

What seemed like a smart engineering decision had disastrous results earlier this week, when a bus equipped with a natural gas-powered fuel tank on its roof collided with a low tunnel overpass. The bus was quickly engulfed in flames as a powerful blast swept through the city streets, blowing out its windows and strewing debris everywhere.

The Drive spotted video of the incident, which reportedly occurred in Central Stockholm at the Klara Tunnel around am on Sunday. Though the scene was chaotic, it wasn't quite the disaster you'd expect: The bus was out of service at the time, and the only victim was the driver, who escaped with severe burns and was rushed to the hospital, according to the Associated Press.

There's an obvious advantage to having a gas tank on the top, rather than at the back of a bus, where it's far more susceptible to accidents and normal fender benders. But, having it on the roof can open the possibility for different kinds of dangers.

The bus was attempting to clear a tunnel that hung too low for it to pass, something the driver either failed to recognize or ignored, despite t