A 22-year-old woman has been arrested in connection with a suspected acid attack on a three-year-old boy last month.

The woman, from Handsworth in Birmingham, is the seventh person to be arrested following the incident at a homes store in Worcester that left the child with injuries to his face and an arm.

West Mercia police said: “Police investigating a suspected acid attack on a three-year-old boy in Worcester on Saturday 21 July have arrested a seventh person in connection with the investigation.

“The woman, aged 22-years-old from Handsworth, Birmingham, was arrested for conspiracy to commit grievous bodily harm in Handsworth. She is currently in police custody in Worcester.”

The boy suffered serious burns at a Home Bargains store in the Tallow Hill area of Worcester.

The child was treated at the scene by paramedics and taken to hospital but discharged. The long-term implications of his injuries are not yet known.

Six men including the boy’s father were charged with conspiracy to commit grievous bodily harm. The father, who cannot be identified for legal reasons, was charged alongside Saied Hussini, 41, and Norbert Pulko, 22, both from London, Jan Dudi, 25, and Adam Cech, 27, both from Birmingham, and Jabar Paktia, 41, from Wolverhampton.

They have appeared in court and were remanded in custody for a hearing at Worcester crown court on 28 August.