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Four people claim to have been injured in a second Alton Towers rollercoaster collision in less than a month.

Mirror.co.uk has learned that two carriages collided on the Sonic Spinball ride on Tuesday.

Eye-witness Danny Robinson, 24, from Liverpool, who was watching his four pals, claimed the carriage was going at "full pace" when it crashed into another carriage containing a young family at the end of the ride.

But Alton Towers has denied claims the collision happened at "full pace" and insisted the carriages "nudged each other at walking pace".

Speaking about the incident, which happened at around 2.30pm, Danny claimed: "I was stood with the bags watching them when it happened.

"The carriage came round to the end at full pace and crashed into one with a young family inside.

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"The mum in the other carriage was screaming.

"Two of my friends hit the back of their heads and another two hurt their necks.

"They spent about 20 minutes getting them out of the carriage.

"All four were taken to the medical centre spent two-and-a-half hours getting checked over and heat pads on their necks.

"Afterwards one of them started throwing up everywhere and ended up going to hospital."

Another passenger @AmieJohno wrote on Twitter: "So today iv (sic) been to Alton towers and my carriage crashed into another one on the sonic spinball ... Safe to say I won't be going again!"

Alton Towers said that following the incident the guests were advised to go the park's medical centre "purely as a precaution".

She added: "On arrival, our medical team had no concerns."

One of the passengers involved, a 36-year-old man is understood to be still off work recovering.

The three women, aged 33, 30 and 22 are not believed to have needed further treatment.

An Alton Towers spokeswoman said: "Two cars in the station area nudged each other at walking pace.

"The guests on the two cars walked off and we advised that they attend our medical centre as a precautionary measure."

In a separate incident yesterday, a mum said her teenage daughter suffered heatstroke and had to be lowered down from the ride on a harness after it was stuck for around 40 minutes.

Clare Kowalski told the Mirror: "My 16-year-old daughter was stuck at the top of Sonic Spinball in the middle of the day for 40 minutes.

"She had to be put in a harness and climb down.

"She has been sick a number of times since and I think she has sun stroke, it's her school prom tonight and she is hoping she will be well enough to go."

The Alton Towers spokeswoman added: "All rides are performing exactly as they are designed to do – including computer and process controlled shut downs which do happen.

"There have been two such instances on Sonic Spinball in the last two days.

"Yesterday there was an automatic stoppage triggered by a sensor on the ride that resulted in three cars being evacuated.

"This was completed in line with our standard processes and we had team members with the guests at all time to give them reassurance and to provide refreshments.

"In both cases the ride reopened shortly afterwards."

Yesterday, passengers riding the Air rollercoaster were left hanging face down in midair for 20 minutes after the ride stopped in the middle of a run.

Theme park bosses say passengers were taken off the ride within 20 minutes and the stoppage was within "expected levels".

Meanwhile, a further 80 people were stuck inside sweltering carriages for an hour after two monorail trains stopped due to a technical issue.

Last month, 16 people were hurt when the Smiler rollercoaster crashed into an empty carriage at the theme park.

Were you on the rollercoaster? Call us on 0207 2933 035 or e-mail richard.wheatstone@trinitymirror.com