Would-be robber critical after falling three storeys in Sydney

An alleged robber is in a critical condition after falling three floors from an apartment building in Sydney's west.

Emergency services were called to Castlereagh Street in Liverpool just after 12.30am this morning over reports a man had suffered serious injuries.

Paramedics treated the 36-year-old man at the scene before rushing him to Liverpool Hospital with critical injuries.

Police said initial investigations suggest the man had fallen three storeys after breaking into an apartment.

A crime scene has been established and police have urged anyone with information to come forward.