The boy, three, suffered the horrific attack on Sunday at the Shrub Hill Retail Park in Worcester.

West Mercia Police said on Monday they had arrested three men over the acid attack inside the Home Bargains department store.

The names and ages of the suspects haven't been released, but cops said the trio, 22, 25 and 26, were all arrested in London.

Corrosive liquid was hurled at the toddler in what pollice have described as a targeted attack.

After the incident, reports Daily Mail, the mother was heard screaming: "What have they done to my baby?"

(Image: WESTMERCIAPOLICE )

The toddler was seriously injured and suffered serious burns after he was attacked in his pushchair.

He has been released from hospital, although the impact on his health is not yet clear.

A fourth man, 39, from Wolverhampton, was arrested on Saturday.

All four have been arrested on suspicion of conspiracy to commit grievous bodily harm.

One witness said: "There was a bit of shouting and screaming in the store but then it all went quiet.

(Image: SWNS )

"But then this woman ran outside and started screaming that her baby had been hurt and needed help."

Worcester City Council leader Marc Bayliss described the attack as "absolutely pure evil".

He said: "Worcester is not that sort of place. We are a quintessential small English city.

"I have never heard of an attack in Worcester, so this is absolutely not something we have any experience of."

Detective Inspector Tony Garner said: "We'd like to thank everyone who shared our appeal over the weekend and contacted us with information; all of this is helping us to build up a better picture of this incident.

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"We're continuing to urge anyone else with information to contact us."

The attack occured at 2.15pm in Shrub Hill Retail Parlk.

The mother was on a shopping trip at the time while the boy sat in his pushchair.

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Donna Bird, who runs a city centre pub, told The Sun: "It's sickening to think that someone would do this, let alone to a three-year-old defenceless child. Nowhere is safe anymore.

"To think that this happened when you're going shopping or just going out about your normal day. I hope he makes a full recovery, must be heartbreaking for his parents."