About six boys, all under the age of 18, are said to have been confronted by another group who accused them of "looking at them funny".

After the unknown liquid was thrown, it is believed that at least two people ran away down the alleyway near to the Norwich Walk-In Centre and down the steps.

The unfolding scene in Rouen Road, with boys seen wearing specialist suits (Image: Bruno Brown) Two police cars, three ambulances and three fire engines are on the scene in Rouen Road, which was closed off from the top to the junction with Halfords.

Three of the boys were receiving treatment........

© Norwich Evening News