Emergency services were called to a "deliberate" fire underneath a busy road bridge on Monday afternoon which caused thick black smoke to billow across the city centre in Newport.
Fire crews were sent to extinguish a fire which is believed to have been started deliberately near Pill, under George Street Bridge at around 4.30pm.
It took just 30 minutes for the fire service to put out the flames.
Officers from Gwent Police also attended the scene but left after half-an-hour once the fire was out. A burnt-out vehicle remains at the scene.
Pictures from the scene in the immediate aftermath show what looks like the burnt out remains of a caravan between the large concrete pillars which support George Street Bridge/B4237 which spans the River Usk.
A spokesman for the South Wales Fire and Rescue Service said: "At approximately 4.27pm on Monday, March 1, we received reports of a fire in Pill, Newport.
"Crews from Maindee and Malpas station attended the scene and extinguished the fire.
The incident is suspected to have been deliberate."
Firefighters left the scene at 4.54pm.
A spokesperson for Gwent Police confirmed the force assisted the fire service and said: "We received a report of a fire close to the George Street Bridge, Newport at around 4.35pm on Monday, March 1."
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