Lancashire Fire & Rescue Service crews called to a fire in the city centre have been joined by additional fire engines.
Six engines were originally called to the scene in Birley Street at around 1.40pm.
At around 2.20pm, they were joined by additional crews from Wesham, Chorley, Leyland, Longridge and Blackburn.
A new statement from Lancashire Fire & Rescue Service said: “At 2.24pm the response of additional fire engines and crews was increased to provide more firefighters equipped with breathing apparatus to complete a thorough search of the flats on the 6th and 7th floors to locate the source of the fire and any casualties.
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“As yet no casualties have been reported. Additional fire engines and crews from: Wesham, Chorley, Leyland, Longridge, Blackburn (pump + Command Unit).”
A section of Church Street is closed as a result of the incident.
The original statement from Lancashire Fire & Rescue Service said: “999 call reporting smoke from a vent of flat on sixth floor of 12 story building on Birley Street, Preston.
“Two fire engines and crews from Preston, one from Penwortham, one from Bamber Bridge, one from Fulwood and an aerial ladder platform and crew from Preston. Firefighters are on sixth floor investigating source.”