A fire has broken out between Ladbrokes in Queen Street and Grove Road car park.
The fire engulfed a small yard, the surrounding fence and discard kitchen appliances in an adjacent alleyway.
Police are currently on the scene and the fire crew have just arrived on the scene.
Firefighters were called at 3.42pm and crews from Maidenhead and Slough are on the scene.
Royal Berkshire said they received 24 999 calls.
Updates to follow.
Arfan Mohammed, works at Istanbul Grill, in Queen Street which backs onto the area where the fire broke out.
He told the Advertiser: “We heard a loud bang, then we went outside and saw the smoke and called the fire brigade.
“We could feel the heat from inside the shop.”
A resident from one of the flats opposite, who did not want to be named, said: “People are always dumping stuff behind there so it could have been anything really.”
Taisbia Hussain was exercising in the Bodyfit gym a couple of doors down from the blaze.
“I heard an explosion then shortly after we could smell the smoke coming in through the window,” he said.
Watch manager Yemi Cullimore, from Maidenhead Fire Station, spoke at the scene after the blaze had been brought under control.
He said: “There’s a lot of rubbish in this area that has caught fire, but we are unable to say how at this stage.”
PC Tom Dorman was one of the first police officers to arrive on the scene and helped secure the area.
He said: “We are still in the process of working out what happened and who owns the land.”
A spokesman for the fire and rescue service confirmed they were called at around 3.42pm and had received 24 999 calls about the fire.
A second fire crew from Slough was also sent to assist with extinguishing the blaze.
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