Firefighters battled to put out a blaze in Eastney this afternoon after smoke was spotted billowing into the sky.
Hampshire Fire and Rescue confirmed two appliances from Southsea had been called to a single-storey building off Fort Cumberland Road, near Fraser Range, shortly after 1.45pm.
The crews used breathing apparatus and high pressure jets to stop the fire spreading.
A spokesman confirmed a room had been ‘completely destroyed’ but no-one had been injured.
In April The News reported how youths had been caught starting fires near the derelict ex-navy training centre.
Southsea Fire Station watch manager Jamie Wren said multiple incidents had led to the station upping the number of firefighters who attend call-outs.