A spokeswoman for the Attorney General's Office said the sentence will be referred to the Court of Appeal, where three judges will decide whether or not the sentence is unduly lenient.
Having carefully reviewed this case, the Attorney General, Dominic Grieve QC MP, has decided to refer the sentence of Lewis Gill to the Court of Appeal for review.
The case will in due course be heard by three Court of Appeal judges who will decide whether they should increase the sentence.
More top news
A pensioner who is believed to be armed with a gun is in a stand-off with police.
One of the world's longest-running conflicts is set to come to an end.
Four people have been stabbed in a series of knife attacks at the Notting Hill Carnival.